CLEAR AUDIO AND LONG RANGE - DECT 6.0 technology provides clear audio transmission, eliminating annoying background noise while allowing you to move from room to room. Up to 1,000 feet of range lets you stay connected to your baby from another room 5-LEVEL SOUND INDICATOR AND 2-WAY TALK-BACK INTERCOM - LEDs on the parent unit indicate the level of sound in your baby's room so you can visually monitor the noise level. The built-in intercom on the parent unit lets you talk to your baby from any room NIGHT LIGHT ON THE BABY UNIT - A soothing light on the baby unit gently illuminates a dark nursery. Both the parent unit(s) and baby unit allow you to turn on or off the nighlight on the baby unit SOUND SENSITIVITY OF THE BABY UNIT - You can choose to hear sounds from the baby unit all the time, or to hear sounds that exceed a certain level. You can use the parent unit to adjust the microphone sensitivity of your baby unit The parent unit runs on rechargeable Ni-MH battery or AC power. To continuously monitor your baby, make sure you use both battery and AC power at the same time. With the battery alone, the parent unit can cordlessly run for a short time only