We installed this ser outside our garage doors. Th I s allowed delivery (Fedx,USPS,UPS) to notify us when they had made a delivery. As our garage is on the side of the main house, using a wired bell would have been costly and difficult. This wireless unit did the trick and as there two transmitter receivers, we had one on the lower floor and one on the second floor. Inexpensive and easy way to solve our problem.
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