Designed for individual areas of your home or office, the Sterling Infrared PIR Motion Sensor, which is a standalone magnetic door contact alarm, will activate a loud 100dB alarm when an intruder enters. Ideal for sheds, outbuildings, mobile homes, garages and indoor home use. The PIR electronic sensor detects motion up to seven metres, and there are two infrared remote control key fobs included. The key fobs will arm and disarm up to five metres away, and it will auto reset after 30 seconds. Sterling Infrared PIR Motion Sensor Plastic