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Ultrasonic alarm- Ideal for protecting van doors and shed doors. Up for sale is a 12v magnetic door switch alarm. 3, The alarm will go off when you open the door but instantly turn off once the door is shut.
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.