Wireless door bell

1.Simple and convenient wireless designed;

2.The telecontrol distance is 100m in open area which can meetdifferent requirement for different dweling house;

3.Share-frequency but different encode designing can avoid mutual interference;

4.Avoid mutual interference;Very low energy loss.Use replaceable 12V battery in reportcontroller.One battery canuse for one year(twenty times/day).

6.the bottom device allowed interchanged and designed moreaccording to requements