4 COBRA CXT237 MicroTalk 20 Mile FRS/GMRS 22 Channel Walkie Talkie 2-Way Radios UHF/FM: Ultra-clear long distance reception Up to a 20 mile range (depends on terrain &amp; conditions) 2662 Channel Combinations: Available when the 22 channels are combined with the 142 privacy codes (38 CTCSS/104 DCS), these combinations prevent interference from other radios. Battery Saver Circuitry: A unique circuit extends the life of the batteries. If there are no transmissions within 10 seconds, the unit will automatically switch to battery saver mode. VOX: The user's voice is detected and the radio transmits without the need to press any buttons, freeing hands for other tasks. 5 VOX sensitivity levels allow the user to select at which point the radio will detect their voice.