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Outdoor motion sensors in the security system Outdoor motion detectors in the security system are motion detection devices that are designed for outdoor use. The housing of these sensors is often rugged and waterproof, allowing them to be mounted outdoors. Outdoor motion detectors for alarms are suitable for monitoring activity outside the home, warehouse, office, etc. In order to make sure that there are no unauthorized persons in the closed area. When the outdoor sensor detects movement in the detection zone, depending on the settings, it activates the siren, informs the system users and the security company about the alarm, turns on the light and more.