Amazing. Easy to set up, easy to turn on and off, inconspicuous, and very loud! My dad accidentally set one off and was blown away by how loud the alarm was. This was worth the price just to see his reaction. The adhesive seems really solid, so these should last a long time. This is a great deal for ten of these. We gave a few to my neighbor, and he is also very happy with them. Thank you for a great product!
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