Tomy Walkabout Premier Advance Monitor: Walkabout Premier Advance is a feature packed monitor that benefits from Tomy's advanced system technology plus a whole host of other features: Advanced System Technology: 4 channels 300m range 2 way communication Privacy guaranteed Additional Features: Sound-sensitive light display – stay alert to baby’s needs even with the sound turned down Nightlight on baby unit which can be remotely operated by the parent unit – no need to disturb baby using the main light in the nursery Recharging docking station for parent unit – no hassle with batteries LCD display with temperature read – to keep an eye on the nursery temperature. Batteries: 4 x AA (batteries will beep when low)