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Magnetic Sensor: Consists of two parts — a magnet and a sensor. When opened, the sensor detects the absence of the magnet and triggers the alarm. Testing: Test the sensor to ensure it is working correctly by opening and closing the door or window to check if the alarm is triggered.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.