Instead of sounding an alarm, the motion sensor sends a wireless signal to a pager carried by the caregiver (clipped to a belt or inside a pocket). This allows the caregiver to be notified wherever they are without disturbing residents. When positioned along the bedside the fall monitor will alarm as the resident attempts to vacate the bed. (extendable bracket is sold separately). Wireless sensor operates on 3 AA batteries. Pager operates on 2 AA batteries. Batteries not included.