We previously purchased the same unit with two receivers and one transmitter (doorbell). We then realized that we also needed a doorbell for the back door. Since the manufacturer doesn't sell the transmitter alone, we decided to get the one button/one receiver package. The current and the new devices pared seamlessly to each other. Additionally, an added bonus: we are able to set a different ring/chime to distinguish between the front and backdoor.We highly recommend this product by this manufacturer.
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