BebeSounds Angelcare Movement Baby Monitor Sensor detects your baby`s slightest movements, even while she sleeps. Relax away from the nursery with the knowledge that an alarm will sound alerting you to check your baby only if she becomes absolutely s till for 20 seconds and no movement whatsoever is detected. The portable Sound Monitor will pick up not only the alarm but also your baby`s cries and other nursery sounds making it 2 monitors in 1. In addition, the movement sensor has an optional "ti c" feature; if the Sensor Pad senses movement, the Nursery Unit will continuously tick. Features: -Includes an under-the-mattress Sensor Pad, Nursery Unit, a Sound monitor and two AC adapters -Can only be used to monitor one baby at a time -Alerts yo u when baby is still for 20 seconds -Can also operate with 8 AAA batteries (not included