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RF Exposure Info

Shenzhen Baseus Technology Co., Ltd. PM153 Baseus Open-EarTWS Earbuds 2A482-PM153 2A482PM153 pm153

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Document DEVICE REPORTGetApplicationAttachment.html?id=8199928 
RF EXPOSURE EVALUATION METHOD FCC ID: 2A482-PM153 Applicable standard In accordance with FCC 47 CFR part 2 (2.1093) this device has been defined as a portable device which is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. Portable devices must be evaluated using the specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEEC95.1-1992. and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003. Per FCC KDB 447498 D01 v06, the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances s 50 mm are determined by: SAR Test Exclusion Thresholds for 100 MHz ­ 6 GHz and  50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table.
The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances  50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [f(GHz)]  3.0 for 1-g SAR and  7.5 for 10-g extremity SAR,where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is  50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion.

BT
Modulation GFSK
/ 4 DQPSK 8DPSK

Frequency
(MHz) 2402 2441 2480 2402 2441 2480 2402 2441 2480

Maximum Conducted Output Power(PK) (dBm) -4.21 -4.73 -4.95 -3.32 -4.03 -4.23 -2.68 -3.34 -3.52

Conducted Output Power Limit dBm 21 21 21 21 21 21 21 21 21

max possible output power (PK, conducted)-3±1dBm -2dBm=0.63mW
2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.63/5*2.402=0.1953.0
2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.63/5*2.441=0.1973.0
2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.63/5*2.48=0.1983.0

BLE
Modulation GFSK(1Mbps)
GFSK(2Mbps)

Frequency
(MHz) 2402 2440 2480 2402 2440 2480

Maximum Conducted Output Power(PK) (dBm) -1.75 -2.52 -2.69 -1.76 -2.33 -2.49

Conducted Output Power Limit dBm 30 30 30 30 30 30

max possible output power (PK, conducted)-2±1dBm -1dBm=0.79mW
2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.79/5*2.402=0.2453.0
2440MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.79/5*2.440=0.2473.0
2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [f(GHz)]= 0.79/5*2.48=0.2493.0

Conclusion: 1. [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [f(GHz)] < 3.0. 2. SAR Test Exclusion Thresholds is 3.0 for separation distance 5mm. Therefore, SAR test is not required.

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