These are just awesome and extremely simple to use and set up. They come with everything you need to mount just about anywhere. I installed 1 of mine on a dresser drawer so when someone (kids) is being overly curiousAn alarm will sound when drawer is open. And let me tell you these things are LOUD. So loud I heard it all the way in the background . Kid was so scared he about drop dead. .These things work grate for window security or just to scare your kids.
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