1: Tape. this is the best i have ever used. Period. Nothing ever came close.2. These are by far the best "well made" window alarms I've ever had in my life. ALL cheap ones fall apart quickly. Loud enough to deter an intruder. I can't expect rock concert level noise from a small personal alarm. Here's what you need to know: these are the best out there. I've tried all the "cheap" ones. They all literally fall apart in the blink of an eye. And they "fall" out of the windows too. It's all crap compared to that.
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