Please note :
The "light indicator" on KQ-688 transmitter is dummy, which will not light up. And it won't affect the functionality.
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.
![](//gdetail.image-gmkt.com/590/266/777266590/2017/6/fdf5074c-9171-4f71-9f40-d0bb1b567d3e.jpg)
![](//gdetail.image-gmkt.com/590/266/777266590/2017/6/5ebed9ba-c191-430a-8669-0eb9715ce814.jpg)