Angelcare AC401 Movement

Angelcare AC401 Movement and Sound Monitor Deluxe Plus, Aqua/White in great condition comes from a pet and smoke free home Every little sound, every little movement This award-winning baby movement & sound monitor system is both pretty and practical. Slide the Sensor Pad under the crib mattress and its motion detectors will pick up the slightest movements, whether baby is sound asleep or wide awake. Not sure how to work angelcare AC401. As you can see in the pictures, monitor lights are on. Batteries are not included