CONVENIENT AND DURABLE: walkie talkie communication radios, compact size, easy to hold in hand, 11cm x 5.7cm x 2.9cm plus antenna length: 9.7cm, weight 130g, Rainproof, pressure resistant, easy to use for all ages, each radio has a detachable belt clip for easy carrying and usePERFECT EXPERIENCE: Wireless walkie-talkies with built-in high-quality speakers for crisp, clear sound, radio push-to-talk buttons, and built-in microphone: each radio has a built-in microphone and push-to-talk button; Professional Walkie Talkie with dedicated headphones. when the walkie headsets are connected, all sound is transmitted to the headphones and the radio speakers are mutedPROGRAMMABLE MULTI-CHANNEL: Wireless intercoms frequency range from 400 to 470 MHz UHF, 16 preset channels, each radio has the same preset frequency for immediate use, 16-bit mechanical rotary switch channel selector, turning the knob to change the channel prompts you channel number, channel frequency can be set in the frequency rangeMULTIPLE FUNCTIONS: Voice activated VOX transmission, high/low power conversion, with built-in flashlight and emergency alarm, voice report function and transmission time limit, automatic blocking when busy and low power mode scrambling, perfect for use in construction buildings, security guard, outdoor sports etc