Samcom 10-Channel Digital FM Intercom with Two Way Radio Systerm Smart Walkie Talkie INTERCOM --Simple to use" Instant" Intercom system ; 10 Channel Latest Version ;Individually LOCK, Talk and Group call function; Lock button (or monitor function) continuously last 10 Hours Frequency Range: 462 - 469.95 (MHz) WALKIE TAKIE--High Illumination Flashlight ; Scrambler ; Noise Reduction Circuit;1500mAh Li-ion battery; Low Voltage Alert; Intelligent Charging ; VOX / CTCSS/DCS function/Scanning function/Emergency alarm function Free connect ability from intercom to two way radio Effective distance Approx. 3000 feet