The tranmitter 12V23A battery factory pre-installed ,This is a standard battery, the local purchase is very cheap(NOT include battery)
52 ringtones(16 chord)to choose from and 4 steps volume control(25~110dB)
Eye-catching backlight flashes when someone pushes the doorbell.
Different quantity of push unit(transmitter) and chime unit(receiver) are free to pair together.
If paired multiple push units in one system,the chime can be set to different for each push unit.
Using learning code to prevent interference from other wireless transmitters
Automatically save selected ringtone after power off.
Remote control button longevity design, an average of 5 times a day, you can use for 25 year
Transmitter size 80x33x17mm Receiver size 86mmx86mmx20mm