I hooked up 2 of these sensors (one of which is over a year old at the moment) to the same indoor bell and I've found them to be very reliable and fairly sensitive, not detecting many false alarms. If there's a false positive, it's usually a squirrel or a deer (unfortunately those suckers roam around in the early hours). Storms where there was no sun at all. I recently discovered that each sensor can be assigned different tones, so I have 2 separate 'rings' for movement at the back and front entrances to my property - very useful!
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