Sometimes all your baby needs is to hear the sound of your voice. Comfort your infant from any room with the built-in intercom on the portable parent unit. Vibrating sound-alert on the parent unit. Enjoy some added peace by being silently alerted when there is sound in your baby’s room. Night light on baby unit.A soothing light on the baby unit gently illuminates a dark nursery. 5-level sound indicator LEDs on the parent unit indicate the level of sound in your baby’s room so you can visually monitor the noise level with the unit muted. DECT 6.0 digital technology provides clear audio transmission and superior range eliminating annoying background noise while allowing you to move from room to room.