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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 exposure
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 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.
Before a new model phone is available for sale to the
public, it must be tested and certified to the FCC
that it does not exceed the exposure limit
established by the FCC. Tests for each model phone
are performed in positions and locations (e.g. at the
ear and worn on the body) as required by the FCC.
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