Licence Free UHF/FM Radio with up to 8Km range, 8 Channels and communicates with all other 446 Radios.User's voice is detected by VOX (Voice activated transmission) and the radio transmits without the need to press any buttons, freeing the user's hands for other tasks. 5 VOX sensitivity levels allow user to select at which point the radio will detect their voiceProvides up to 5 easily recognisable call alerts for incoming callsRoger Beep Confirmation tone indicates the completion of the user's transmission, and signals to others it is clear to talk. This feature is selectable and can be turned on or offA unique circuit extends the life of your batteries. If there are no transmissions within 10 seconds, the until will automatically switch to battery saver modeMicro-USB chargeable. Rechargeable batteries can be charged inside the radio. Backlit LED DisplayThe AM645 in the 'Adventure' series of Cobra Walkie Talkies is suitable for outdoor activities such as Hiking, Camping, Jogging but also during group activities and work related projects. It has up to 8Km range and over 968 channel combinations. The VOX functions make it easy for handsfree use. Rechargeable batteries and USB charging cable are included.