Product details:

Features: 38 subchannels allow several users to communicate individually using the same channel. An electronic voice tells you what settings you are adjusting, so you do not have to take off the headset to check. Unused, the set automatically switches off after two hours to save the batteries. An auxiliary input also lets you connect a cellular phone or external com radio, regardless of the frequency. For safety reasons, the external system has signal priority. You can also connect a CD player or FM radio and listen to news and music.