This all-in-one motion sensor doorbell combines infrared detection and alarm functions and is popular for its convenience and practicality. A detection range of 2 to 6 meters a horizontal detection angle of 110 and a vertical detection angle of 15 allow you to install this pirate doorbell in many places e.g. such as shops sheds offices apartments garages warehouses restaurants public buildings etc. Designed with 3 mode switches volume buttons music buttons power button and power connector This welcome alarm doorbell is easy to use and works with a flashing light when someone walks by to activate it. You can use it as a front doorbell to say 'Hello welcome' or as a motion sensor alarm with a continuous alarm sound like 'Woo...' for about 15 seconds or as a store/home pirate chime play selected music. Technical parameters: Working current: Detection range: 4-8m Detection angle: 110. Installation height: 1.5m-2.5m Size: 80*50*75mm (length*width*height) Wireless working frequency: 433MHz Sound: up to 90 decibels Battery installation diagram: pull Remove the battery cover from the switch to open the battery cover. The installation is correct press the battery switch and the installation is complete. Package Includes: 1xM5 Motion Sensor with Alarm and Doorbell