The screen of the intercom lights on to indicate the level of activity of the baby. Two channels to minimize interference. Light on / off. The receiver works with AC power or batteries. Hook for attachment to the belt, so you can take the receiver everywhere you go. Pilot light indicator of the batteries. Works with batteries, not included. Presented in a decorated box with a transparent window: 23x20x7cm. Estimated distance: 100-200 m