SAFE, NON-CONTACT TECHNOLOGY: Because the Movement Sensor Pad is placed under your baby’s mattress, no part of the monitor is touching them. As soon as the Nursery Unit is turned on, the monitor starts tracking movement and will only alarm if no movement is detected for 20 seconds. You can rest assured your baby is sleeping safely because the detector can’t be touched or moved by them.EXTRA PEACE OF MIND: Do you already own another brand of baby monitor but want to add in Movement monitoring for extra peace of mind now baby is here? The Angelcare Baby Breathing Movement Monitor is perfect because it tracks the tiniest of movements and it will work with any other brand of baby monitor.BATTERY OPERATED: This makes the Angelcare Baby Breathing Movement Monitor ideal for traveling! It also has a low battery alarm alerting you to when the batteries need to be replaced.ONE-TIME INSTALLATION TECHNOLOGY: The Sensor Pad tracks all your baby’s slightest wriggles across the entire surface of the mattress without baby even knowing it’s there. It's a simple, one-time installation underneath the mattress, preventing any contact with the sensitive skin of your baby.