RF Exposure report

FCC ID: EMOIBTW88

RF Exposure Info

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FCCID_4277817

RF EXPOSURE EVALUATION EUT Specification EUT Portable Bluetooth Speaker with Wireless Fast Charger Model Number iBTW88 FCC ID EMOIBTW88 Antenna gain (Max) -0.33dBi Operation Frequency 2402-2480MHz Input Rating DC 3.7V Battery Classification Per §15.247(i), §2.1093 Stipulated Test Standard Kind of Device: Bluetooth Ver.4.2 Modulation BT:(GFSK, π/4-DQPSK) BLE:(GFSK) Max. output power BT: 2.92dBm(0.001959W) BLE: -2.26dBm(0.000594W) Test Requirement: RF EXPOSURE EVALUATION 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) Frequency Electric Field Magnetic Field Power Average Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm2) Time (A) Limits for Occupational/Control Exposures 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 300-1500 -- -- F/1500 6 1500-100000 -- -- 1 30

1 Friis transmission formula: Pd= (Pout*G)\ (4*pi*R2) Where Pd= Power density in mW/cm2 Pout=output power to antenna in mW G= Numeric gain of the antenna relative to isotropic antenna Pi=3.1416 R= distance between observation point and center of the radiator in cm Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the nd total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. 2 Measurement Result Antenna gain:-0.33 dBi BT DSS: Transmi Power Power Measur Tune Max Output Ant. t Ant. density at density ed upPow tune up Peak Gain Freque Mode Gain 20cm Limits Power er power(d power (numer ncy(MH (dBi) (mW/ (mW/ (dBm) (dBm) Bm) (mW) ic) z) cm2 ) cm2 ) 2.402 GFSK 1.91 2±1 3 1.995 -0.33 0.927 0.000368 1 2.441 GFSK 1.94 2±1 3 1.995 -0.33 0.927 0.000368 1 2.480 GFSK 1.59 2±1 3 1.995 -0.33 0.927 0.000368 1 Π/4-D 2.512 -0.33 0.927 0.000463 2.402 2.83 3±1 4 1 QPSK Π/4-D 2.512 -0.33 0.927 0.000463 2.441 2.92 3±1 4 1 QPSK Π/4-D 2.512 -0.33 0.927 0.000463 2.480 2.73 3±1 4 1 QPSK

BT DTS: Tra ansmi Power Powwer Me easur Tune T M Max Ou utput Ant.. t Annt. density at denssity ed up pPow tun ne up Peak P Gainn Frreque Mo ode Gaain 20cm m Limits Po ower er pow wer(d po ower (numeer nc cy(MH (dB Bi) (mW W/ (mW W/ (d dBm) (d dBm) B Bm) (m mW) ic) z) cm2 2) cm22) 2.402 2 G GFSK -2 2.52 -3±1 -2 0.631 -0.3 33 0.9277 0.000116 1 2.441 2 G GFSK -2 2.26 -2±1 -1 0.794 -0.3 33 0.9277 0.000146 1 2.480 2 G GFSK -2 2.55 -3±1 -2 0.631 -0.3 33 0.9277 0.000116 1 Signature: L Lisa Wang Daate: 2019--04-10


Document Created: 2019-05-13 19:36:49
Document Modified: 2019-05-13 19:36:49
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