Overview The VTech DM111 features DECT 6.0 digital technology for clear transmission and eliminates background noise, so you can rest assured the only sounds you will hear are your babys. LED lights on the parent unit indicate the level of sound in your babys room so you can visually monitor the noise level with the unit muted. More Information Clip the parent unit to your belt and take advantage of the extended range and battery-powered operationVolume controlOut of range indicatorHigh sensitivity microphoneOnOff indicatorBattery compartment in parent unit for increased mobility (batteries not included)