Product dimensions: width 56mm, thickness 30mm, height 145mm (including antenna). Product material: ABS. Product supply: 4 AAA batteries per unit (not included); If you don't intend to use them long term; Please turn off the device and remove the battery Transmit power: 0.5w, dialogue distance 0.5 - 3KM from the horizontal plane. Call ringtones selection: This machine has a variety of different ringtones to choose from, suitable for the customization of you. Channel scanning function: this possibility automatically scans 22 channels in order and can select a valid channel currently in use. Night lighting function: there is a small lighting lamp (white lamp) on the top of the machine, which can be used as a flashlight at night to facilitate the night work. Equipped with a belt clamp that allows children to place the intercom at the waist or elsewhere. Other functions: Backlit LCD display Multiple channel selection with channel display Battery detection Ten call tone options < p>Tone switch function Key switch function Memory and recovery of factory settings We only sell walkie-talkies , no other items on the photos. Due to differences between displays, the pictures may not reflect the actual color of the item. Minor dimensional errors are allowed due to manual measurement .