Great doorbell! We installed this in our Warehouse/Office that took NO TIME to install. We placed 2 in the office area within 100ft of the receivers with two different sounds. We placed 2 next to the overhead doors for deliveries with the same sound. We can tell exactly which door to open when it sounds. The delivery doors are about 1,100 feet from the office and it works GREAT! Our 2 story office is inside the warehouse but it is built with concrete blocks. PS.our UPS driver is much happier now!
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