Motion Sensor and Wireless Hallway Alarm is an exceptionally easy monitoring system to use. Set up is simple for the TL-2800 Motion Sensor and Hallway Alarm, just insert the batteries, place the motion sensor and wireless alarm where desired and the TL-2800 Motion Sensor Alarm System is ready to use. Place the motion sensor next to the bed or a doorway and when the sensor field is interrupted a signal is sent to the wireless alarm. The alarm monitor can be placed in the hallway to alert caregivers of resident activity. Motion sensor requires 1-9v battery and receiver uses 3-C batteries or optional AC adaptor. (batteries not included).