Zte SKINNY R286 User Manual page 54

RF SAFETY INFORMATION
The handset has an internal antenna located at the top of the phone. For
optimum performance with minimum power consumption do not cover the
antenna area with your hand. Hold the handset between thumb and finger in
the middle of the device. Covering the antenna affects call quality, may cause
the handset to operate at higher power level than needed, and may shorten
talk and idle times.
RADIO FREQUENCY ENERGY
The handset is a low-power radio transmitter and receiver. When switched on it
intermittently transmits radio frequency (RF) energy (radio waves). The transmit
power level is optimized for best performance and automatically reduces when
there is good quality reception. Maximum power is only used at the edge of
network coverage so under most circumstances the power output is very low.
Under poor network conditions the phone transmits at a higher power, may get
hot and have a significantly shorter battery life.