FeaturesVOX - voice-activated transmissionUp to 8 km rangeCall alert with 5 selectable tones2662 channel combinationsIncludes rechargeable batteriesGetting ready for your next hike, camping trip or other outdoor activity? This Cobra AM645 PMR 2 Way Walkie Talkie has a compact design with up to 8 kilometer range. Voice-activated (VOX) transmission frees hands for other tasks. It has five selectable tones to distinguish between different parties for incoming calls. A total of 2662 channel combinations are available when the 22 channels are combined with the 121 privacy codes (38 CTCSS/83 DCS). These combinations prevent interference from other radios.