I've had them for over a year now and the batteries that came with them are still working. I hear an alarm upstairs (my house is about 2000 square feet). I have them on all my windows and doors because they are so cheap. I want to know that if someone tries to break into my house at night, I can hear the alarm, call the police, and immediately grab my gun. I feel a lot safer. Cool guy. None of them have ever fallen off and all have worked. I'll update in a year or so, or when the batteries die or something.
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