I ordered one of these wireless doorbells and it worked great. The package said to make sure the barcode number on the door push-button and the bell receiver matched because their signals are paired together. That led me to believe multiple units could be used within the signal range listed. So, I ordered two more (back door and basement door). Each pair had unique barcode numbers coded on the units. However, each push-button rang all of the bell receivers. Overstock gladly accepted the return. As always, GREAT customer service!!!
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