DO NOT in anyway shape or form jar these sensors.

The device itself works great. I bought it to help keep a check on an elderly parent from roaming. The sensor that lets you know a door has opened is so sensitive to failure that just putting the back on it after activating it can break the sensor so it won't work. The sodering that makes it work is so fragile and impossible to repair if it does break. I've already spent money to replace one broken sensor and it lasted all of about 3 days. Again, it works great, but be very careful on setting it up or replacing the batteries because thats when it breaks.

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