niu Tek 4D2, User Manual

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an accessory that contains no metal and that positions the
handset a minimum of 1.0 cm from the body.
Non-compliance with the above restrictions may result in
violation of RF exposure guidelines.
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 poser required to reach the
network. In general, the closer you are to a wireless base
station antenna, the lower the power output.