12. FCC SAR Test Report

FCC ID: TE7UB400

RF Exposure Info

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FCCID_4263579

FCC SAR Test Report FCC ID: TE7UB400 Project No. : 1812C107 Equipment : Bluetooth 4.0 Nano USB Adapter Model Name : UB400 Applicant : TP-Link Technologies Co., Ltd. Address : Building 24(floors1,3,4,5) and 28(floors1-4) Central Science and Technology Park, Shennan Rd, Nanshan, Shenzhen, China Date of Receipt : Dec. 18, 2018 Date of Test : Apr. 24, 2019 Issued Date : Apr. 30, 2019 Tested by : BTL Inc. PREPARED BY : (Rot Liang) APPROVED BY : (Herbort Liu) BTL INC. No.3, Jinshagang 1st Road, Shixia, Dalang Town, Dongguan, Guangdong, China. TEL: +86-769-8318-3000 FAX: +86-769-8319-6000 Report No.: BTL-FCC SAR-1-1812C107 Page 1 of 27 Report Version: R00

Declaration BTL represents to the client that testing is done in accordance with standard procedures as applicable and that test instruments used has been calibrated with standards traceable to international standard(s) and/or national standard(s). BTL's reports apply only to the specific samples tested under conditions. It is manufacture’s responsibility to ensure that additional production units of this model are manufactured with the identical electrical and mechanical components. BTL shall have no liability for any declarations, inferences or generalizations drawn by the client or others from BTL issued reports. The report must not be used by the client to claim product certification, approval, or endorsement by NIST, A2LA, or any agency of the U.S. Government. This report is the confidential property of the client. As a mutual protection to the clients, the public and ourselves, the test report shall not be reproduced, except in full, without our written approval. BTL’s laboratory quality assurance procedures are in compliance with the ISO/IEC 17025 requirements, and accredited by the conformity assessment authorities listed in this test report. BTL is not responsible for the sampling stage, so the results only apply to the sample as received. The information, data and test plan are provided by manufacturer which may affect the validity of results, so it is manufacturer’s responsibility to ensure that the apparatus meets the essential requirements of applied standards and in all the possible configurations as representative of its intended use. Limitation For the use of the authority's logo is limited unless the Test Standard(s)/Scope(s)/Item(s) mentioned in this test report is (are) included in the conformity assessment authorities acceptance respective. Please note that the measurement uncertainty is provided for informational purpose only and are not use in determining the Pass/Fail results. Report No.: BTL-FCC SAR-1-1812C107 Page 2 of 27 Report Version: R00

Table of Contents Page 1 . GENERAL SUMMARY 6 2 . RF EMISSIONS MEASUREMENT 7 2.1 TEST FACILITY 7 2.2 MEASUREMENT UNCERTAINTY 7 3 . GENERAL INFORMATION 8 3.1 STATEMENT OF COMPLIANCE 8 3.2 GENERAL DESCRIPTION OF EUT 8 3.3 LABORATORY ENVIRONMENT 8 3.4 MAIN TEST INSTRUMENTS 9 4 . SAR MEASUREMENTS SYSTEM CONFIGURATION 10 4.1 SAR MEASUREMENT SET-UP 10 4.1.1 TEST SETUP LAYOUT 10 4.2 DASY5 E-FIELD PROBE SYSTEM 11 4.2.1 EX3DV4 PROBE SPECIFICATION 11 4.2.2 E-FIELD PROBE CALIBRATION 12 4.2.3 OTHER TEST EQUIPMENT 13 4.2.4 SCANNING PROCEDURE 14 4.2.5 DATA STORAGE AND EVALUATION 15 4.2.6 SPATIAL PEAK SAR EVALUATION 16 4.2.7 DATA EVALUATION BY SEMCAD 17 5 . SYSTEM VERIFICATION PROCEDURE 19 5.1 TISSUE VERIFICATION 19 5.2 SYSTEM CHECK 20 5.3 SYSTEM CHECK PROCEDURE 20 6 . SAR MEASUREMENT VARIABILITY AND UNCERTAINTY 21 6.1 SAR MEASUREMENT VARIABILITY 21 7 . OPERATIONAL CONDITIONS DURING TEST 22 7.1 TEST POSITION 22 7.1.1 BODY TEST CONFIGURATION 22 8 . TEST RESULT 23 8.1 CONDUCTED POWER RESULTS 23 8.1.1 CONDUCTED POWER MEASUREMENTS OF BT 23 8.2 SAR TEST RESULTS 24 8.2.1 SAR MEASUREMENT RESULT OF BT 24 8.3 MULTIPLE TRANSMITTER EVALUATION 25 Report No.: BTL-FCC SAR-1-1812C107 Page 3 of 27 Report Version: R00

Table of Contents Page APPENDIX 26 1. TEST LAYOUT 26 Appendix A. SAR Plots of System Verification Appendix B. SAR Plots of SAR Measurement Appendix C. Calibration Certificate Appendix D. Photographs of the Test Set-Up Report No.: BTL-FCC SAR-1-1812C107 Page 4 of 27 Report Version: R00

REPORT ISSUED HISTORY Report Version Description Issued Date R00 Original Issue Apr. 30, 2019 Report No.: BTL-FCC SAR-1-1812C107 Page 5 of 27 Report Version: R00

1. GENERAL SUMMARY Equipment Bluetooth 4.0 Nano USB Adapter Brand Name tp-link Model Name UB400 Manufacturer TP-Link Technologies Co., Ltd. Building 24(floors1,3,4,5) and 28(floors1-4) Central Science and Address Technology Park, Shennan Rd, Nanshan, Shenzhen, China Standard(s) ANSI Std C95.1:1992 Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz – 300 GHz.( IEEE Std C95.1-1991) IEEE Std 1528:2013 Recommended Practice for Determining the Peak Spatial-Average Specific Absorption Rate (SAR) in the Human Head from Wireless Communications Devices: Measurement Techniques KDB447498 D01 General RF Exposure Guidance v06 KDB447498 D02 SAR Procedures for Dongle Xmtr v02 KDB865664 D01 SAR measurement 100 MHz to 6 GHz v01r04 KDB865664 D02 SAR Reporting v01r02 KDB690783 D01 SAR Listings on Grants v01r03 The above equipment has been tested and found compliance with the requirement of the relative standards by BTL Inc. The test data, data evaluation, and equipment configuration contained in our test report (Ref No. BTL-FCC SAR-1-1812C107) were obtained utilizing the test procedures, test instruments, test sites that has been accredited by the Authority of A2LA according to the ISO/IEC 17025 quality assessment standard and technical standard(s). Report No.: BTL-FCC SAR-1-1812C107 Page 6 of 27 Report Version: R00

2. RF EMISSIONS MEASUREMENT 2.1 TEST FACILITY The test facilities used to collect the test data in this report is SAR room at the location of No.3,Jinshagang 1st Road, ShiXia, Dalang Town,Dong Guan, China.523792 2.2 MEASUREMENT UNCERTAINTY Note: Per KDB865664 D01 SAR Measurement 100 MHz to 6 GHz, when the highest measured 1-g SAR within a frequency band is < 1.5 W/kg, the extensive SAR measurement uncertainty analysis described in IEEE Std 1528-2013 is not required in SAR reports submitted for equipment approval. The equivalent ratio (1.5/1.6) is applied to extremity and occupational exposure conditions. Report No.: BTL-FCC SAR-1-1812C107 Page 7 of 27 Report Version: R00

3. GENERAL INFORMATION 3.1 STATEMENT OF COMPLIANCE Mode Body SAR-1g(W/kg) Bluetooth 0.05 Note: The highest reported SAR for body is 0.05W/kg. Note: 1) The device is in compliance with Specific Absorption Rate(SAR) for general population uncontrolled exposure limits according to the FCC rule §2.1093, the ANSI C95.1:1992/IEEE C95.1:1991, the NCRP Report Number 86 for uncontrolled environment, and had been tested in accordance with the measurement methods and procedures specified in IEEE Std 1528-2013 . 3.2 GENERAL DESCRIPTION OF EUT Equipment Bluetooth 4.0 Nano USB Adapter Model Name UB400 Test Sample Engineering Sample No.: D181211643 HW Version 1.0 SW Version 1.0 Modulation BT(GFSK/π/4-DQPSK/8-DPSK) Operation Frequency Band TX (MHz) RX (MHz) Range(s) Bluetooth 2400-2483.5 Test Channels 0-39-78 (BT) (low-mid-high) 0-19-39 (LE) Band Ant Gain(dBi) Antenna Gain Bluetooth 0.58 3.3 LABORATORY ENVIRONMENT Temperature Min. = 18ºC, Max. = 25ºC Relative humidity Min. = 30%, Max. = 70% Ground system resistance < 0.5Ω Ambient noise is checked and found very low and in compliance with requirement of standards. Reflection of surrounding objects is minimized and in compliance with requirement of standards. Report No.: BTL-FCC SAR-1-1812C107 Page 8 of 27 Report Version: R00

3.4 MAIN TEST INSTRUMENTS Item Equipment Manufacturer Model Serial No. Cal. Date Cal. Interval 1 Data Acquisition Electronics Speag DAE4 1390 May 11, 2018 1 Year 2 E-field Probe Speag EX3DV4 7396 May 29, 2018 1 Year 3 System Validation Dipole Speag D2450V2 919 Jun. 11, 2018 3 Years Twin Sam 4 Twin Sam Phantom Speag 1896 N/A N/A Phantom V5.0 5 Power Amplifier Mini-Circuits ZHL-42W+ QA1333003 Feb. 25, 2019 1 Year 6 DC Source lteck OT6154 M00157 Oct. 12, 2018 1 Year 7 ENA Network Analyzer Agilent E5071C MY46102965 Mar. 10, 2019 1 Year MXG Analog Signal 8 Agilent N5181A MY49060710 Aug. 11, 2018 1 Year Generator 9 P-series power meter Agilent N1911A MY45100473 Aug. 11, 2018 1 Year 10 Wideband power sensor Agilent N1921A MY51100041 Aug. 11, 2018 1 Year 11 Peak Power Analyzer Keysight 8990B MY51000506 Nov. 26, 2018 1 Year 12 Wideband Power Sensor Keysight N1923A MY58310004 Nov. 26, 2018 1 Year 13 Dielectric Assessment Kit Speag DAK-3.5 1226 N/A N/A 14 Dual directional coupler Woken TS-PCC0M-05 107090019 Mar. 10, 2019 1 Year 15 Coupler Woken 0110A05601O-10 COM5BNW1A2 Mar. 10, 2019 1 Year 16 Digital Themometer LKM DTM3000 3519 Jul. 19, 2018 1 Year 17 Thermohygrometer Parkoo JR609 N/A Aug. 23, 2018 1 Year Note: 1. “N/A” denotes no model name, serial No. or calibration specified. 2. 1) Per KDB865664 D01 requirements for dipole calibration, the test laboratory has adopted three-year extended calibration interval. Each measured dipole is expected to evaluate with the following criteria at least on annual interval in Appendix C. a) There is no physical damage on the dipole; b) System check with specific dipole is within 10% of calibrated value; c) The most recent return-loss result , measured at least annually, deviates by no more than 20% from the previous measurement; d) The most recent measurement of the real or imaginary parts of the impedance, measured at least annually is within 5Ωfrom the previous measurement. 2) Network analyzer probe calibration against air, distilled water and a short block performed before measuring liquid parameters. Report No.: BTL-FCC SAR-1-1812C107 Page 9 of 27 Report Version: R00

4. SAR MEASUREMENTS SYSTEM CONFIGURATION 4.1 SAR MEASUREMENT SET-UP The DASY5 system for performing compliance tests consists of the following items: 1. A standard high precision 6-axis robot (Stäubli RX family) with controller and software. An arm extension for accommodating the data acquisition electronics (DAE). 2. A dosimetric probe, i.e. an isotropic E-field probe optimized and calibrated for usage in tissue simulating liquid. The probe is equipped with an optical surface detector system. 3. A data acquisition electronic (DAE) which performs the signal amplification, signal multiplexing, AD-conversion, offset measurements, mechanical surface detection, collision detection, etc. The unit is battery powered with standard or rechargeable batteries. The signal is optically transmitted to the EOC. 4. A unit to operate the optical surface detector which is connected to the EOC. 5. The Electro-Optical Coupler (EOC) performs the conversion from the optical into a digital electric signal of the DAE. The EOC is connected to the DASY5 measurement server. 6. TheDASY5 measurement server, which performs all real-time data evaluation for field measurements and surface detection, controls robot movements and handles safety operation. A computer operating Windows. 7. DASY5 software and SEMCAD data evaluation software. 8. Remote control with teach panel and additional circuitry for robot safety such as warning lamps, etc. 9. The generic twin phantom enabling the testing of left-hand and right-hand usage. 10. The device holder for handheld mobile phones. 11. Tissue simulating liquid mixed according to the given recipes. 12. System validation dipoles allowing to validate the proper functioning of the system. 4.1.1 TEST SETUP LAYOUT Report No.: BTL-FCC SAR-1-1812C107 Page 10 of 27 Report Version: R00

4.2 DASY5 E-FIELD PROBE SYSTEM The SAR measurements were conducted with the dosimetric probe EX3DV4(manufactured by SPEAG),designed in the classical triangular configuration and optimized for dosimetrice valuation. 4.2.1 EX3DV4 PROBE SPECIFICATION Construction Symmetrical design with triangular core Interleaved sensors Built-in shielding against static charges PEEK enclosure material (resistant to organic solvents, e.g., DGBE) Calibration ISO/IEC 17025 calibration service available Frequency 10 MHz to 6 GHz Linearity: ± 0.2 dB (30 MHz to 6 GHz) Directivity ± 0.3 dB in HSL (rotation around probe axis) ± 0.5 dB in tissue material (rotation normal to probe axis) Dynamic Range 10 µW/g to > 100 mW/g Linearity:± 0.2dB Dimensions Overall length: 330 mm (Tip: 20 mm) Tip diameter: 2.5 mm (Body: 12 mm) Distance from probe tip to dipole centers: 1.0 mm EX3DV4 E-field Probe Report No.: BTL-FCC SAR-1-1812C107 Page 11 of 27 Report Version: R00

4.2.2 E-FIELD PROBE CALIBRATION Eachprobeiscalibratedaccordingtoadosimetricassessmentprocedurewithaccuracybetterthan±10 %.The spherical isotropy was evaluatedandfoundtobebetterthan±0.25dB.The sensitivity parameters (NormX, NormY, NormZ), the diode compression parameter (DCP) and the conversion factor(ConvF) of the probe are tested. The free space E-field from amplified probe outputs is determined in a test chamber. This is performed in a TEM cell for frequencies bellow 1 GHz, and in a wave guide above 1 GHz for free space. For the free space calibration, the probe is placed in the volumetric center of the cavity and at the proper orientation with the field. The probe is then rotated 360 degrees. E-field temperature correlation calibration is performed in a flat phantom filled with the appropriate simulated brain tissue. The measured free space E-field in the medium correlates to temperature rise in a dielectric medium. For temperature correlation calibration a RF transparent thermistor-based temperature probe is used in conjunction with the E-field probe. Where: ∆t=Exposure time(30 seconds), C =Heat capacity of tissue (brain or muscle), ∆T=Temperature increase due to RF exposure. Or Where: σ=Simulated tissue conductivity, ρ=Tissue density (kg/m3). Report No.: BTL-FCC SAR-1-1812C107 Page 12 of 27 Report Version: R00

4.2.3 OTHER TEST EQUIPMENT 4.2.3.1 Device Holder for Transmitters Construction: Simple but effective and easy-to-use extension for Mounting Device that facilitates the testing of larger devices(e.g., laptops, cameras, etc.) It is lightweight and fits easily on the upper part of the Mounting Device in place of the phone positioner. The extension is fully compatible with the Twin SAM, ELI4and SAM v6.0Phantoms. Material: POM, Acrylic glass, Foam 4.2.3.2 Phantom Model Twin SAM Construction The shell corresponds to the specifications of the Specific Anthropomorphic Mannequin (SAM) phantom defined in IEEE 1528 and IEC 62209-1. It enables the dosimetric evaluation of left and right hand phone usage as well as body mounted usage at the flat phantom region. A cover prevents evaporation of the liquid. Reference markings on the phantom allow the complete setup of all predefined phantom positions and measurement grids by teaching three points with the robot. Shell Thickness 2 ± 0.2 mm Filling Volume Approx. 25 liters Length:1000mm; Width: 500mm Dimensions Height: adjustable feet Aailable Special Report No.: BTL-FCC SAR-1-1812C107 Page 13 of 27 Report Version: R00

4.2.4 SCANNING PROCEDURE The DASY5 installation includes predefined files with recommended procedures for measurements and validation. They are read-only document files and destined as fully defined but unmeasured masks. All test positions (head or body-worn) are tested with the same configuration of test steps differing only in the grid definition for the different test positions. The “reference” and “drift” measurements are located at the beginning and end of the batch process. They measure the field drift at one single point in the liquid over the complete procedure. The indicated drift is mainly the variation of the DUT’s output power and should vary max. ± 5 %. The “surface check” measurement tests the optical surface detection system of the DASY5 system by repeatedly detecting the surface with the optical and mechanical surface detector and comparing the results. The output gives the detecting heights of both systems, the difference between the two systems and the standard deviation of the detection repeatability. Air bubbles or refraction in the liquid due to separation of the sugar-water mixture gives poor repeatability (above ± 0.1mm). To prevent wrong results tests are only executed when the liquid is free of air bubbles. The difference between the optical surface detection and the actual surface depends on the probe and is specified with each probe. (It does not depend on the surface reflectivity or the probe angle to the surface within ± 30°.)  Area Scan The “area scan” measures the SAR above the DUT or verification dipole on a parallel plane to the surface. It is used to locate the approximate location of the peak SAR with 2D spline interpolation. The robot performs a stepped movement along one grid axis while the local electrical field strength is measured by the probe. The probe is touching the surface of the SAM during acquisition of measurement values. The standard scan uses large grid spacing for faster measurement. Standard grid spacing for head measurements is 15 mm in x- and y- dimension(≤2GHz), 12 mm inx- and y- dimension(2-4 GHz) and 10mm in x- and y- dimension(4-6GHz). If a finer resolution is needed, the grid spacing can be reduced. Grid spacing and orientation have no influence on the SAR result. For special applications where the standard scan method does not find the peak SAR within the grid, e.g. mobile phones with flip cover, the grid can be adapted in orientation.  Zoom Scan A “zoom scan” measures the field in a volume around the 2D peak SAR value acquired in the previous “coarse” scan. This is a fine grid with maximum scan spatial resolution:Δxzoom, Δyzoom≤ 2GHz -≤8mm, 2-4GHz -≤5 mm and 4-6 GHz-≤4mm; Δzzoom≤3GHz -≤5 mm, 3-4 GHz-≤4mm and 4-6GHz-≤2mm where the robot additionally moves the probe along the z-axis away from the bottom of the Phantom. DASY is also able to perform repeated zoom scans if more than 1 peak is found during area scan. In this document, the evaluated peak 1g and 10g averaged SAR values are shown in the 2D-graphics in Appendix B. Test results relevant for the specified standard (see chapter 1.4.) are shown in table form form in chapter 7.2. A Z-axis scan measures the total SAR value at the x-and y-position of the maximum SAR value found during the cube scan. The probe is moved away in z-direction from the bottom of the SAM phantom in 2 mm steps. This measurement shows the continuity of the liquid and can - depending in the field strength – also show the liquid depth. Report No.: BTL-FCC SAR-1-1812C107 Page 14 of 27 Report Version: R00

4.2.5 DATA STORAGE AND EVALUATION 4.2.5.1Data Storage The DASY5 software stores the acquired data from the data acquisition electronics as raw data (in microvolt readings from the probe sensors), together with all necessary software parameters for the data evaluation (probe calibration data, liquid parameters and device frequency and modulation data) in measurement files with the extension “DAE”. The software evaluates the desired unit and format for output each time the data is visualized or exported. This allows verification of the complete software setup even after the measurement and allows correction of incorrect parameter settings. For example, if a measurement has been performed with a wrong crest factor parameter in the device setup, the parameter can be corrected afterwards and the data can be re-evaluated. The measured data can be visualized or exported in different units or formats, depending on the selected probe type ([V/m], [A/m], [°C], [mW/g], [mW/cm²], [dBrel], etc.). Some of these units are not available in certain situations or show meaningless results, e.g., a SAR output in a lossless media will always be zero. Raw data can also be exported to perform the evaluation with other software packages. Report No.: BTL-FCC SAR-1-1812C107 Page 15 of 27 Report Version: R00

o# 3TL é@ sumr A m,!, The following table summarizes the area scan and zoom scan resolutions per FCC KDB 865664D01: Maximun Area Maximun Zoom Maximun Zoom Scan spatial resolution Minimum Frequency Scan Scan sp;tlal Uniform Grid Graded Grad zoom scan resolution resolution Aezson(D) Aeisenl1)* AZzecn{n21)" volume (BXaren B¥aes) |_(AX7com: AYzoom ) ten Ter * uy.z) <2GHz < 15mm <8mm $ 515Azzeon(h—1) >30mm 2—3GHz 2mm $‘6zz..,(n—1) mm 3—4GHz 2mm 5"AZzcen(D—1) mm 4—5GHz Omm 5"AZzzen(D—1) mm 5—60Hz Omm 5"Azzeen(n1) 22mm 4.2.6 SPATIAL PEAK SAR EVALUATION The spatial peak SAR — value for 1 and 10 g is evaluated after the Cube measurements have been done. The basis of the evaluation are the SAR values measured at the points of the fine cube grid consisting of 5 x 5 x 7 points( with 8mm horizontal resolution) or 7 x 7 x 7 points( with 5mm horizontal resolution) or 8 x 8 x 7 points( with 4mm horizontal resolution). The algorithm thatfinds the maximal averaged volume is separated into three different stages. m The data between the dipole center of the probe and the surface of the phantom are extrapolated. This data cannot be measured since the center of the dipole is 2.7 mm away from the tip of the probe and the distance between the surface and the lowest measuring point is about 1 mm (see probe calibration sheet). The extrapolated data from a cubs measurement can be visualized by selecting "Graph Evaluated". m The maximum interpolated value is searched with a straight—forward algorithm. Around this maximum the SAR — values averaged over the spatial volumes (1g or 10 g) are computed using the 3d—spline interpolation algorithm. If the volume cannot be evaluated (i.e., if a part of the grid was cut off by the boundary of the measurement area) the evaluation will be started on the comners of the bottom plane of the cube. m All neighboring volumes are evaluated until no neighboring volume with a higher average value is found. Extrapolation The extrapolation is based on a least square algorithm [W. Gander, Computer mathematic, p.168—180]. Through the points in the first 3 cm along the z—axis, polynomials of order four are calculated. These polynomials are then used to evaluate the points between the surface and the probetip. The points, calculated from the surface, have a distance of 1 mm from each other. Interpolation The interpolation of the points is done with a 3d—Spline. The 3d—Spline is composed of three one—dimensional splines with the "Not a knot"—condition [W. Gander, Computer mathematic, p.141—150] (x, y and 2 —direction) [Numerical Recipes in C, Second Edition, p.123ff ]. Volume Averaging At First the size of the cube is calculated. Then the volume is integrated with the trapezcidal algorithm. 8000 points (20x20x20) are interpolated to calculate the average. Advanced Extrapolation DASY5 uses the advanced extrapolation option which is able to compensate boundary effects on E—field probes. Report No.: BTL—FCC SAR—1—18120107 Page 16 of 27 Report Version: ROO

4.2.7 DATA EVALUATION BY SEMCAD The SEMCAD software automatically executes the following procedures to calculate the field units from the microvolt readings at the probe connector. The parameters used in the evaluation are stored in the configuration modules of the software: Probe parameters: Sensitivity Normi, ai0, ai1,ai2 Conversion factor ConvFi Diode compression point Dcpi Device Frequency f parameters: Crest factor cf Media parameters: Conductivity Density These parameters must be set correctly in the software. They can be found in the component documents or they can be imported into the software from the configuration files issued for the DASY5 components. In the direct measuring mode of the multimeter option, the parameters of the actual system setup are used. In the scan visualization and export modes, the parameters stored in the corresponding document files are used. The first step of the evaluation is a linearization of the filtered input signal to account for the compression characteristics of the detector diode. The compensation depends on the input signal, the diode type and the DC-transmission factor from the diode to the evaluation electronics. If the exciting field is pulsed, the crest factor of the signal must be known to correctly compensate for peak power. The formula for each channel can be given as: Vi= Ui+ Ui2· cf/ dcpi With Vi= compensated signal of channel i (i = x,y,z ) Ui= input signal of channel i ( i = x, y,z ) cf=crest factor of exciting field (DASY parameter) dcpi=diode compression point (DASY parameter) Report No.: BTL-FCC SAR-1-1812C107 Page 17 of 27 Report Version: R00

From the compensated input signals the primary field data for each channel can be evaluated: E-field probes: Ei= ( Vi/ Normi·ConvF)1/2 H-field probes: Hi= ( Vi)1/2· ( ai0+ ai1f+ ai2f2)/ f With Vi= compensated signal of channel i (i = x,y,z ) Normi= sensor sensitivity of channel i ( i = x, y,z ) 2 [mV/(V/m) ]for E-field Probes ConvF = sensitivity enhancement in solution aij=sensor sensitivity factors for H-field probes f=carrier frequency [GHz] Ei=electric field strength of channel i in V/m Hi= magnetic field strength of channel i in A/m The RSS value of the field components gives the total field strength (Hermitian magnitude): Etot= (EX2+ EY2+EZ2)1/2 The primary field data are used to calculate the derived field units. SAR= (Etot)2 ·σ/ (ρ·1000) With SAR=local specific absorption rate in mW/g Etot=total field strength in V/m =conductivity in[mho/m]or[Siemens/m] 3 =equivalent tissue density in g/cm Note that the density is normally set to 1(or1.06), to account for actual brain density rather than the density of the simulation liquid. The power flow density is calculated assuming the excitation field to be a free space field. Ppwe= Etot2/3770orPpwe= Htot2· 37.7 With Ppwe= equivalent power density of a plane wave in mW/cm2 Etot=total field strength in V/m Htot=total magnetic field strength in A/m Report No.: BTL-FCC SAR-1-1812C107 Page 18 of 27 Report Version: R00

5. SYSTEM VERIFICATION PROCEDURE 5.1 TISSUE VERIFICATION The simulating liquids should be checked at the beginning of a series of SAR measurements to determine of the dielectic parameter are within the tolerances of the specified target values. The measured conductivity and relative permittivity should be within ± 5% of the target values. The following materials are used for producing the tissue-equivalent materials. Diethylene Tissue Triton Glycol Bactericide DGBE HEC NaCl Sucrose Water Type X-100 Mono- hexylether Body 2450 - 31.4 - 0.1 - - 68.5 - Salt: 99+% Pure Sodium Chloride; Sugar: 98+% Pure Sucrose; Water: De-ionized, 16M + resistivity HEC: Hydroxyethyl Cellulose; DGBE: 99+% Di(ethylene glycol) butyl ether,[2-(2-butoxyethoxy)ethanol] Triton X-100(ultra pure): Polyethylene glycol mono [4-(1,1,3,3-tetramethylbutyl)phenyl]ether Tissue Verification Liquid Targeted Targeted Deviation Deviation Tissue Frequency Conductivity Permittivity Temp. Conductivity Permittivity Conductivity Permittivity Date Type (MHz) (σ) (εr) (℃) (σ) (εr) (σ) (%) (εr) (%) Body 2450 22.1 1.985 51.431 1.95 52.7 1.79 -2.41 Apr. 24, 2019 Note: 1)The dielectric parameters of the tissue-equivalent liquid should be measured under similar ambient conditions and within 2 °C of the conditions expected during the SAR evaluation to satisfy protocol requirements. 2)KDB 865664 was ensured to be applied for probe calibration frequencies greater than or equal to 50MHz of the EUT frequencies. 3)The above measured tissue parameters were used in the DASY software to perform interpolation via the DASY software to determine actual dielectric parameters at the test frequencies. The SAR test plots may slightly differ from the table above since the DASY rounds to three significant digits. Report No.: BTL-FCC SAR-1-1812C107 Page 19 of 27 Report Version: R00

5.2 SYSTEM CHECK The system check is performed for verifying the accuracy of the complete measurement system and performance of the software. The system check is performed with tissue equivalent material according to IEE Std 1528 (described above). The following table shows system check results for all frequency bands and tissue liquids used during the tests. Targeted Measured normalized System Frequency Deviation Dipole Date SAR-1g SAR-1g SAR-1g Check (MHz) (%) S/N (W/kg) (W/kg) (W/kg) Body Apr. 24, 2019 2450 50.80 13.20 52.80 3.94 919 5.3 SYSTEM CHECK PROCEDURE The system check is performed by using a system check dipole which is positioned parallel to the planar part of the SAM phantom at the reference point. The distance of the dipole to the SAM phantom is determined by a plexiglass spacer. The dipole is connected to the signal source consisting of signal generator and amplifier via a directional coupler, N-connector cable and adaption to SMA. It is fed with a power of 250 mW(below 3GHz) or 100mW(3-6GHz). To adjust this power a power meter is used. The power sensor is connected to the cable before the system check to measure the power at this point and do adjustments at the signal generator. At the outputs of the directional coupler both return loss as well as forward power are controlled during the system check to make sure that emitted power at the dipole is kept constant. This can also be checked by the power drift measurement after the test. System check results have to be equal or near the values determined during dipole calibration (target SAR in table above) with the relevant liquids and test system(±10 %). Report No.: BTL-FCC SAR-1-1812C107 Page 20 of 27 Report Version: R00

6. SAR MEASUREMENT VARIABILITY AND UNCERTAINTY 6.1 SAR MEASUREMENT VARIABILITY Per KDB865664 D01 SAR measurement 100 MHz to 6 GHz v01r04, SAR measurement variability must be assessed for each frequency band, which is determined by the SAR probe calibration point and tissue-equivalent medium used for the device measurements. The additional measurements are repeated after the completion of all measurements requiring the same head or body tissue-equivalent medium in a frequency band. The test device should be returned to ambient conditions (normal room temperature) with the battery fully charged before it is re-mounted on the device holder for the repeated measurement(s) to minimize any unexpected variations in the repeated results. 1) Repeated measurement is not required when the original highest measured SAR is < 0.80 W/kg; steps 2) through 4) do not apply. 2) When the original highest measured SAR is ≥ 0.80 W/kg, repeat that measurement once. 3) Perform a second repeated measurement only if the ratio of largest to smallest SAR for the original and first repeated measurements is > 1.20 or when the original or repeated measurement is ≥ 1.45 W/kg (~ 10% from the 1-g SAR limit). 4) Perform a third repeated measurement only if the original, first or second repeated measurement is ≥1.5 W/kg and the ratio of largest to smallest SAR for the original, first and second repeated measurements is > 1.20. The same procedures should be adapted for measurements according to extremity and occupational exposure limits by applying a factor of 2.5 for extremity exposure and a factor of 5 for occupational exposure to the corresponding SAR thresholds. The detailed repeated measurement results are shown in Section 8.2. Report No.: BTL-FCC SAR-1-1812C107 Page 21 of 27 Report Version: R00

7. OPERATIONAL CONDITIONS DURING TEST 7.1 TEST POSITION 7.1.1 BODY TEST CONFIGURATION Test all USB orientations [see figure below: (A) Horizontal-Up, (B) Horizontal-Down, (C) Vertical-Front, and (D) Vertical-Back and Tip with a device-to-phantom separation distance of 5 mm. Fig 1 USB Connector Orientations Implemented on Laptop Computers Report No.: BTL-FCC SAR-1-1812C107 Page 22 of 27 Report Version: R00

8. TEST RESULT 8.1 CONDUCTED POWER RESULTS 8.1.1 CONDUCTED POWER MEASUREMENTS OF BT Average Conducted Power(dBm) BT Tune up CH0 CH39 CH78 2402MHz 2441MHz 2480MHz DH5 10.00 7.28 9.14 9.99 2DH5 9.00 5.39 7.62 8.71 3DH5 9.00 5.38 7.60 8.72 Average Conducted Power(dBm) Max. CH0 CH19 CH39 LE Tune up 2402MHz 2441MHz 2480MHz 11.50 9.68 10.58 11.13 Note: 1) The conducted power of BT is measured with RMS detector. 2) The tested channel results are marks in bold. Report No.: BTL-FCC SAR-1-1812C107 Page 23 of 27 Report Version: R00

8.2 SAR TEST RESULTS General Notes: 1) Per KDB447498 D01, all measurement SAR results are scaled to the maximum tune-up tolerance limit to demonstrate compliant. 2) Per KDB447498 D01, testing of other required channels within the operating mode of a frequency band is not required when the reported 1-g or 10-g SAR for the mid-band or highest output power channel is:≤0.8 W/kg or 2.0 W/kg, for 1-g or 10-g respectively, when the transmission band is≤100 MHz. When the maximum output power variation across the required test channels is > ½ dB, instead of the middle channel, the highest output power channel must be used. 3) Per KDB865664 D01,for each frequency band, repeated SAR measurement is required only when the measured SAR is ≥0.8W/kg; if the deviation among the repeated measurement is ≤ 20%,and the measured SAR <1.45W/kg, only one repeated measurement is required. 4) Per KDB941225 D06, the DUT Dimension is bigger than 9 cm x 5 cm, so 10mm is chosen as the test separation distance for Hotspot mode. When the antenna-to-edge distance is greater than 2.5cm, such position does not need to be tested. 5) Per KDB648474 D04, SAR is evaluated without a headset connected to the device. When the standalone reported body-worn SAR is ≤1.2 W/kg, no additional SAR evaluations using a headset are required. 6) Per KDB865664 D02, SAR plot is only required for the highest measured SAR in each exposure configuration, wireless mode and frequency band combination; Plots are also required when the measured SAR is > 1.5 W/kg, or > 7.0 W/kg for occupational exposure. The published RF exposure KDB procedures may require additional plots; for example, to support SAR to peak location separation ratio test exclusion and/or volume scan post-processing. 8.2.1 SAR MEASUREMENT RESULT OF BT Separation Maximum Conducted Test Test Data Power SAR SAR Reported Band Channel Distance Tune-up Power No. Position Rate Drift 1g 10g 1g SAR (cm) (dBm) (dBm) T01 LE 39 Horizontal Up 0.5 1 11.5 10.58 0.07 0.038 0.013 0.047 T02 LE 39 Horizontal Down 0.5 1 11.5 10.58 0.03 0.028 0.010 0.035 T03 LE 39 Vertical Back 0.5 1 11.5 10.58 0.09 0.040 0.014 0.049 T04 LE 39 Vertical Front 0.5 1 11.5 10.58 0.11 0.023 0.008 0.028 T05 LE 39 Top Side 0.5 1 11.5 10.58 0 <0.001 <0.001 <0.001 T06 LE 0 Vertical Back 0.5 1 11.5 9.68 0.09 0.003 0.001 0.005 T07 LE 78 Vertical Back 0.5 1 11.5 11.13 0.04 0.034 0.013 0.037 Note: The value with boldface is the maximum SAR Value of each test band. Report No.: BTL-FCC SAR-1-1812C107 Page 24 of 27 Report Version: R00

8.3 MULTIPLE TRANSMITTER EVALUATION The following tables list information which is relevant for the decision if a simultaneous transmit evaluation is necessary according to FCC KDB 447498D01 General RF Exposure Guidance v06. The location of the antennas inside the EUT is shown as below picture: Report No.: BTL-FCC SAR-1-1812C107 Page 25 of 27 Report Version: R00

APPENDIX 1. Test Layout Specific Absorption Rate Test Layout Liquid depth in the flat Phantom (≥15cm depth) MSL_2450_15.3cm Report No.: BTL-FCC SAR-1-1812C107 Page 26 of 27 Report Version: R00

Appendix A. SAR Plots of System Verification (Pls See BTL-FCC SAR-1-1812C107_Appendix A.) Appendix B. SAR Plots of SAR Measurement (Pls See BTL-FCC SAR-1-1812C107_Appendix B.) Appendix C. Calibration Certificate (Pls See BTL-FCC SAR-1-1812C107_Appendix C.) Appendix D. Photographs of the Test Set-Up (Pls See BTL-FCC SAR-1-1812C107_Appendix D.) End of Test Report Report No.: BTL-FCC SAR-1-1812C107 Page 27 of 27 Report Version: R00


Document Created: 2019-05-06 08:51:51
Document Modified: 2019-05-06 08:51:51
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