Retevis RT1 Two Way Radio 10W UHF 400-520 MHz 16CH VOX (2 Pack) and Speaker Mic (2 Pack) and 2 Pin PTT MIC Covert Air Acoustic Earpiece (2 Pack) High-power 10W, Range up to 4 miles (6.4 km)depending on environment and terrain;3600mAh High-capacity battery, 260 hours long standby time 16 memory channel,easy to use: each work group can have their own channel to minimize disruptions in other departments The Scrambler to ensure the communication confidentiality;2 Antenna (High gain antenna and Common antenna),Increase your distance Including the original earpiece, covert air acoustic headset,and speaker mic,original earpiece and covert air headset with PTT can fits snugly in your ear easily which keeps your conversations private;speaker mic can be easily worn on the body through a clip and easy to carry We provide free programming software;There is a password request while reprogramming this radio;Please note that you needn't to enter any password but just click OK will be able to reprogram it