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Title: Worthless on carpet
Review: I bought this alarm of use on my bedroom door to the patio so I can open the door at night for air. If you have carpet and the door is exterior like mine it will not work!! Exterior doors have a rubber bottom door seal that prevents you from putting the tip of the alarm under the door without setting it off. Because of the carpet, all the alarm does is slide backwards over carpet when the door is opened. I even tried velcro on the bottom of the alarm to no avail. Just be warned!!
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