Description: -Bi-directional PIR chime doorbell, 8m(max) infared sensor distance, 100x15 sensor area, 280m working distance, when customers come near, it will say"hello'', and"goodbye" when they are leaving, you will not miss customers; otherwise, customers will fully feel welcomed; -With usb port, it is an effective commercial chime for supermarket promotions, safety warnings, shop discounts; -Audio MP3 player, support music single cycle and list loop, 36 melodies in loop; -113db, high-decibel and clear sound, continue to work effectively through the whole night; welcome and security alert chime in one; Perfect for door side and entrance top of hotel, stores, mall, office, warehouse, plant, villa; -Easy install with guide manual, battery Operation, with low power supply of 1W; -The alarming can last 30 seconds when someone breaks in; -Available to the remote controller; Specification: -Material: ABS plastic -Launcher: 3xAAA(not included) -Receiver: 3xAA(not included) -Power: 1W -Sensing Distance: 8m -Sensing Angle: 100x15 -Working Distance: 280m -Audio Format: MP3 -Launcher: Approx. 82x45x74mm/3.29x1.77x2.91inch -Receiver: Approx. 116x64x26mm/ 4.57x2.52x1.02inch Remote Controller: Material: ABS plastic Size: Approx. 60x40x20mm/ 2.36x1.57x0.79inch Color: Black Left: Turn ON/ Switch Right: Turn OFF Middle: V+/V-, music button Battery: 12V/27A(not included) Package Includes: 1 Set Infrared Doorbell (Remote Controller Sold Separately) Note: 1.Due to the manual measurement, there is a slight color and size difference between the above and the actual item; 2.Please keep the detector and receiver in sheltered places to avoid contact of both units form water and direct sunlight; 3.Clean the detective regularly with a damp cloth to avoid blockage of sensor by dirt or any small;