It is light-control sensor doorbell which operated by 3pcs of AAA size batteries(1.5V).

Install the doorbell on the access,and turn it on.When clients come,it will automatically detect and said” Hello,welcome”or other tones.

The detecting distance is from 3 to 7ms. Widely used for shop,supermarket,stores…..

We advice to install it in the well-light places.

When sound goes low,please change the new battery.