I bought these to alert ME if/when my 86 year old dad with dementia opened a door he wasn't "supposed" to. They were very easy to install, and have worked great. I installed rechargeable batteries, and they work just fine. I installed four alarms, and it's been very handy to have the two external door alarms set to one remote, and the two internal doors set to a separate remote (so I can set them independent of each other.) I was also pleasantly surprised by how loud they are; they awaken me even from the bedroom (with the door open at night). Good value for the money.
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