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How to add the new receivers to your original doorbell? You just need to pair new receivers to transmitters one by one: 1.Plug one new receiver into a regular socket, and pick the sound you want on this receiver. 2. Press and hold the volume button on this receiver about 5 seconds, the receiver will blink with a "ding" sound, and then immediately push the transmitter button to pair with the receiver. Finally you will hear the music you set. 3. The operation method is the same for adding other receivers. Package Includes: 1*Receiver 1*User Manual