Works great as a low occupancy alarm for our property, occasional false alarms but overall an accurate alarm system. Our sonar is 30 feet from the other side of the wall and is not causing any problems. Disappointed with sounds, many songs in the chimes sound bad, but the usual "ding-dong" does. (Note: the shortest alert is two ding-dong alerts, so personally I wouldn't recommend it for higher traffic as I'd prefer a shorter beep.
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