I installed the first one that came out of the bag. It didn't work, removed and installed the second one and it worked as it should. I worked as an alarm technician a few years back so I have installed devices like this many times. These are not as good as the commercial (Ademco) ones but and seem a bit light weight. I expect a good like from these. If it does fail I will get some commercial grade and drill the hole out bigger and replace.These seem like they are worth the money.
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