These FCC RF exposure limits are derived from the recommendations of two
expert organizations: the National Council on Radiation Protection and
Measurement (NCRP) and the Institute of Electrical and Electronics Engineers
(IEEE). In both cases, the recommendations were developed by scientific and
engineering experts drawn from industry, government, and academia after
extensive reviews of the scientific literature related to the biological effects of RF
energy.
The RF exposure limit set by the FCC for wireless mobile devices employs a unit
of measurement known as the Specific Absorption Rate (SAR). The SAR is a
measure of the rate of absorption of RF energy by the human body expressed in
units of watts per kilogram (W/kg). SAR values for wrist worn devices are
measured in reference to (wrist) extremity and head under simultaneous (multiple)
transmitter conditions for each frequency band operation. For speaker mode
communication this device has been tested when worn on the wrist and
positioned a minimum of 1.0 cm from the head. For this device, the FCC safety
limit for extremity SAR is 4.0 W/kg (10gm) and head SAR is 1.6 W/kg (1gm).
