This simple system monitors movement while baby is resting. Our movement sensor pad with sensasure technology is designed to be placed under baby's mattress where it senses subtle movements while baby sleeps. The ac027 is the perfect addition for parents who already own an Angelcare movement monitor. The ac027 will complement the original monitor perfectly by adding movement monitoring on the second mattress to your current setup. It’s particularly useful if you need to monitor twins or 2 little ones in the same room. Do you already own A different brand of baby monitor but want to add in movement monitoring for extra peace of mind now baby is here? The ac027 is perfect because it tracks the tiniest of movements and it will work with all other brand of baby monitor.