Probably one of the cheapest 3 motion sensor devices but unfortunately it gave us too many false alarms. Even if you point it down and away from people, it works. Also, the numbers on the bell block do not indicate zones, but rather numbers indicating which tone of the melody it is. Of course you can assign a specific melody tone to a specific pickup, but they are not numbered 1 through 10 as you might think. Instead there are 0, 1, 2, 3, e and d. And the rest of the "special" melodies - it's the integer "0".
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