2AEUPBHARB001_FCC Confidentiality long Term Letter

FCC ID: 2AEUPBHARB001

RF Exposure Info

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FCCID_4219871

RF Exposure Evaluation Declaration Product Name : Ring Bridge Model No. : 5B01S8 FCC ID : 2AEUPBHARB001 Applicant : Ring, LLC. Address : 1523 26th St, Santa Monica, CA 90404 Date of Receipt : Mar. 25, 2018 Test Date : Mar. 25, 2018 ~ Mar. 26, 2018 Issued Date : Mar. 26, 2019 Report No. : 1932200R-RF-US-P20V01 Report Version : V1.0 The test results relate only to the samples tested. The test results shown in the test report are traceable to the national/international standard through the calibration of the equipment and evaluated measurement uncertainty herein. This report must not be used to claim product endorsement by A2LA or any agency of the government. The test report shall not be reproduced without the written approval of DEKRA Testing and Certification (Suzhou) Co., Ltd.

Report No: 1932200R-RF-US-P20V01 Tes t R ep or t Cer t if ic at i on Issued Date : Mar. 26, 2019 Report No. : 1932200R-RF-US-P20V01 Product Name : Ring Bridge Applicant : Ring, LLC. Address : 1523 26th St, Santa Monica, CA 90404 Manufacturer : Ring, LLC. Address : 1523 26th St, Santa Monica, CA 90404 Model No. : 5B01S8 FCC ID : 2AEUPBHARB001 EUT Voltage : DC 5V Test Voltage : AC 120V/60Hz Applicable Standard : KDB 447498D01V06 FCC Part1.1310 Test Result : Complied Performed Location : DEKRA Testing and Certification (Suzhou) Co., Ltd. No.99 Hongye Rd., Suzhou Industrial Park, Suzhou, 215006, Jiangsu, China TEL: +86-512-6251-5088 / FAX: +86-512-6251-5098 FCC Designation Number: CN1199 Documented By : ( Adm. Specialist: Kitty Li ) Reviewed By : (Senior Project Manager: Frank He ) Approved By : (Engineering Supervisor: Jack Zhang) Page: 2 of 6

Report No: 1932200R-RF-US-P20V01 1. RF Exposure Evaluation 1.1. Limits According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b) LIMITS FOR MAXIMUM PERMISSIBLE EXPOSURE (MPE) Electric Magnetic Power Average Frequency Field Field Density Time Range (MHz) Strength Strength (mW/cm2) (Minutes) (V/m) (A/m) (A) Limits for Occupational/ Control Exposures 300-1500 -- -- F/300 6 1500-100,000 -- -- 5 6 (B) Limits for General Population/ Uncontrolled Exposures 300-1500 -- -- F/1500 6 1500-100,000 -- -- 1 30 F= Frequency in MHz Friis Formula Friis transmission formula: Pd = (Pout*G)/(4*pi*r2) Where Pd = power density in mW/cm2 Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = distance between observation point and center of the radiator in cm Pd is the limit of MPE, 1 mW/cm2. If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Page: 3 of 6

Report No: 1932200R-RF-US-P20V01 1.2. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. The temperature and related humidity: 18℃and 78％ RH. 1.3. Test Result of RF Exposure Evaluation Product : Ring Bridge Test Item : RF Exposure Evaluation Test Site : AC-6  Antenna Information: LoRa: Model No. N/A Antenna manufacturer N/A Antenna Delivery 1*TX+1*RX 2*TX+2*RX 3*TX+3*RX 4*TX+4*RX Antenna technology SISO Basic CDD MIMO Sectorized Beam-forming Antenna Type Dipole External Sectorized PIFA PCB Internal Ceramic Chip Antenna Metal plate type F antenna Antenna Gain -1dBi Page: 4 of 6

Report No: 1932200R-RF-US-P20V01 WIFI(2.4G): Model No. N/A Antenna manufacturer N/A Antenna Delivery 1*TX+1*RX 2*TX+2*RX 3*TX+3*RX 4*TX+4*RX Antenna technology SISO Basic CDD MIMO Sectorized Beam-forming Antenna Type Dipole External Sectorized PIFA PCB Internal Ceramic Chip Antenna Metal plate type F antenna Antenna Gain 1.8dBi Page: 5 of 6

Report No: 1932200R-RF-US-P20V01  Power Density:  Standlone modes: Maximum Power Power Directional Frequency Output Power Density at R Density Limit Test Mode Gain Band (MHz) to = 20 cm at R = 20 cm (dBi) Antenna (dBm) (mW/cm2) (mW/cm2) LoRa 902 ~ 928 18.18 -1 0.010 1.0 WIFI(2.4G) 2412 ~ 2462 13.55 1.8 0.007 1.0    Simultaneous transmission: Power Density at Limit of Power Frequency Band Test Mode EIRP(dBm) R = 20 cm Density (MHz) 2 (mW/cm ) S(mW/cm2) LoRa 902 ~ 928 17.18 0.010 1.0 WIFI(2.4G) 2412 ~ 2462 15.35 0.007 1.0 Simultaneous transmission power density 0.017 1.0 Note: The simultaneous transmission power density is 0.017mW/cm2 for Ring Bridge without any other radio equipment. The End Page: 6 of 6


Document Created: 2019-03-27 00:22:25
Document Modified: 2019-03-27 00:22:25
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