Product dimensions: width 56mm, thickness 30mm, height 145mm (including antenna). Product material: ABS. Product power supply: 4 AAA batteries per unit (not included); If you do not intend to use them for a long time; Turn off the device and remove the battery Transmitter power: 0.5w, dialogue distance 0.5 - 3KM from the horizontal plane. Call ringtone selection: This machine has a variety of ringtones to choose from, suitable for your customization. Channel scan function: this feature 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 night work. Equipped with a belt clip that allows children to place the intercom at the waist or elsewhere. Other features: Backlit LCD screen Multiple channel selection with channel display Battery detection Ten call signal options Tone switching function Key switching function Memory and factory reset We only sell walkie-talkies, no other items in the pictures. Due to differences between monitors, the pictures may not reflect the actual color of the item. Small dimensional errors are allowed due to manual measurement.