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). From the Manufacturer 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).