Sell Vistor Chime (PIR SENSOR)

-P.I.R. sensor activated.
-Placing near the door of shop or office to announce the entrance of visitor.
-Sensor range up to 6 meters, 90 degree.
-Hi/Low volume control for "Ding Dong" melody.
-Battery operated: 4AA Battery or DC-6V 600mA external adaptor.
-Product size: 130 x 70 x 55 mm