The Angel Care Movement Sensor with Sound Monitor detects your baby’s slightest movements, equal while she sleeps. While it may seem because your baby is absolutely still when she is sleeping, she really isn’t. The under-the-mattress Sensor Pad detects your baby’s slightest movements. If your baby goes absolutely still for 20 seconds, the Sensor Pad sends a beckon to the Nursery Unit that sounds an alarm alerting you to crack your baby. If you are out of the baby’s room, the two portable Parents’ Units (Sound Monitor) will pick up the alarm as well as other nursery sounds. In addition, the two Parent Units give you the flexibility of always leaving one in your bedchamber while moving the following division to the chance you are in while your baby is sleep
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1#http://www.squidoo.com/baby-sounds-angelcare-movement-sensor
2#http://bestwirelessbabymonitor.com/bebesounds-angelcare-movement-sensor-w-sound-monitor-w-two-parents-units/