The beautifully designed AC201 Movement and Sound Monitor is an adorable addition to any baby décor. It combines a crystal-clear sound monitor and highly sensitive movement detector in a single system that lets you listen for baby’s cries and alerts you within 20 seconds if no movement is detected in your little sweetheart’s crib. * Under-the-Mattress Movement Sensor Pad – Senses each and every one of your baby"s movements and will sound an alarm if no movement is detected after 20 seconds. Allows you and baby to sleep tight. * Audio "Tic" Feature – Turn on this feature and your Parent Unit will make a ticking sound to reassure you that the monitor is working even when your baby is sleeping silently. * Adjustable Movement Pad Sensitivity – Allows you to select your desired movement sensitivity level. * Sound Lights – Allows you to see and hear the sounds your baby makes. * Nursery Unit operates on AC adapter or backup batteries – What happens if there is a power outage while the family is sleeping? No worries. The Nursery Unit will switch over to battery mode. The battery option is also great for travel. * Portable Parent Unit – Battery operated means it’s portable. The AC adaptor means you always have a solution should your batteries start running low. * Low Battery Indicator