This all-in-one motion sensor doorbell features infrared detection and alarm functionalities, making it a favorite for its convenience and practicality. With a detection range of 2 to 6 meters, a horizontal detection angle of 110 degrees, and a vertical detection angle of 15 degrees, this versatile doorbell can be installed in various locations, including shops, sheds, offices, apartments, garages, warehouses, restaurants, and public buildings. Equipped with three mode switches, volume buttons, music buttons, a power button, and a power connector, this welcome alarm doorbell is user-friendly and activates with a flashing light when someone passes by. It can be utilized as a front doorbell to greet guests or as a motion sensor alarm that produces a continuous sound like "Woo..." for approximately 15 seconds, or even as a chime for stores or homes playing selected music. Technical specifications: Working current: Detection range: 4-8m Detection angle: 110 degrees Installation height: 1.5m-2.5m Dimensions: 80*50*75mm (length*width*height) Wireless working frequency: 433MHz Sound output: up to 90 decibels Battery installation instructions: To open the battery cover, pull the cover off the switch. Ensure the installation is correct, then press the battery switch to complete the installation. Package includes: 1x M5 Motion Sensor with Alarm and Doorbell