Samsung GALAXY S3 Owner's Manual page 52

The RF exposure limit set by the FCC for wireless
mobile phones 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). The FCC requires wireless
phones to comply with a safety limit of 1.6 watts per
kilogram (1.6 W/kg).
The FCC SAR limit incorporates a substantial margin
of safety to give additional protection to the public
and to account for any variations in measurements.
SAR tests are conducted using standard operating
positions accepted by the FCC with the phone
transmitting at its highest certified power level in
all tested frequency bands. Although the SAR is
determined at the highest certified power level, the
actual SAR level of the phone while operating can
be well below the maximum reported value. This is
because the phone is designed to operate at multiple
power levels so as to use only the power required to
reach the network. In general, the closer you are to a
wireless base station antenna, the lower the power
output of the phone.
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