Features: *Unique doorbell with motion sensor detector that triggers the doorbell main unit. *Motion sensor range area is about 7 meters area at an angle of 110 degrees,operating range is about 100 meters(open place). *Independent alarm horn,maximum 110dB.38 different ring tones,volume is adjustable. *Receiver host easily plugs into an electrical outlet,motion sensor uses 3*AAA battery(not included) or micro USB power supply. *Applicable to all kinds of shops, hotels,offices,factories,homes,etc. Specifications: Working Voltage of the Receiver:110V-240V Working Voltage of the PIR Sensor:3*AAA batteries(not included) Working Range: Up to 100 meters(open place) Infrared Sensing Range: Up to about 7 meters PIR Sensor Viewing Angle: 110 degree Music source: 38 different songs Volume Adjustment: high, middle,low Receiver Size: Approx. 80*76*33mm(L*W*H) Sensor Size: Approx. 80*59*45mm(L*W*H) Package Information: Package Size: Approx. 10*9*9cm/3.9*3.5*3.5in Package Weight: Approx. 160g/0.35lb Package List: 1* PIR Sensor 1* Receiver(EU Plug) 1* User Manual(English)