RF Exposure

FCC ID: 2AR8O-BSD01WS

RF Exposure Info

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FCCID_4247981

Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RBJ181108055-00B

FCC §15.247 (i) & §1.1310 & §2.1091- MAXIMUM PERMISSIBLE
EXPOSURE (MPE)
Applicable Standard
According to§15.247(i) and §1.1310, systems operating under the provisions of this section shall be
operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess
of the Commission’s guidelines.

Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091)

(B) Limits for General Population/Uncontrolled Exposure
Frequency Range Electric Field Magnetic Field Power Density Averaging Time
(MHz) Strength (V/m) Strength (A/m) (mW/cm2) (minutes)
0.3–1.34 614 1.63 *(100) 30
1.34–30 824/f 2.19/f *(180/f²) 30
30–300 27.5 0.073 0.2 30
300–1500 / / f/1500 30
1500–100,000 / / 1.0 30

f = frequency in MHz; * = Plane-wave equivalent power density;

According to §1.1310 and §2.1091 RF exposure is calculated.

Calculated Formulary:

Predication of MPE limit at a given distance
S = PG/4R² = power density (in appropriate units, e.g. mW/cm2);
P = power input to the antenna (in appropriate units, e.g., mW);
G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain
factor, is normally numeric gain;
R = distance to the center of radiation of the antenna (appropriate units, e.g., cm);

Calculated Data:

Max. Target Power
Frequency Evaluation Power MPE
Operation Antenna Gain including
Range Distance Density Limit
modes Tolerance
(MHz) (cm) (W/m2) (W/m2)
(dBi) (numeric) (dBm) (mW)
BLE 2402-2480 3 2.00 4 2.51 20.00 0.001 1.0
Wifi 2412-2462 3 2.00 25 316.23 20.00 0.126 1.0

Note 1: the Max. Target Power including Tolerance was declared by manufacturer.
Note 2: Wifi 2.4GHz can`t transmit simultaneously with Bluetooth or 5G wifi.

Result: Compliance, The device meets MPE requirement for Devices Used by the General Public
(Uncontrolled Environment) at distance ≥20 cm.

Page 13 of 65

Document Created: 2019-04-23 06:16:08
Document Modified: 2019-04-23 06:16:08

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