Vue Door Bell BZ-688/KQ688 Extra Transmitter/Receiver
This link sell BZ688/KQ688 Transmitter/Receiver only
It is not the doorbell set
To Pair the Transmitter/Receiver with your existed Doorbell,please follow the step Below:
1.plug the receiver in to your power socket and turn on the power.
2 press and hold the mode button untill you hear the bird peep
3 when you hear the beep,you press the new/old transmitter immediately,and the door bell rings ,it means successfully paired.