Update: so only 3 out of 4 work, changed batteries to no avail, not worth the money sending just one back. The three that actually work are LOUD and easy to attach with the double-sided tape that's on them. Not only do I use them to keep people out, but also to keep my Alzheimer's dad from coming out while I sleep. I would still recommend them to friends and family even though I only have 3 working ones so I've changed from 5 stars to 4.
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