The AC25-1 Baby Movement Monitor with Video and Sound uses a one-of-a-kind innovative wireless Movement Sensor Pad. An alarm will sound on the parent unit if after 20 seconds movements are not detected by the Sensor Pad. The monitor is contact-free and with no use of Wi-Fi for additional security. It’s effective up to 150 meters, includes a handy nightlight and lullaby feature. As well as two-way-talk-back, room temperature display and a large 4.3” LCD screen with push button operation.