Features: 1.Perfect Welcoming Experience: Automatically plays music through an infrared sensor, alerting visitors and creating a welcoming ambient for the store. 2.Intelligent Technology: Adopting a separate design, the infrared sensor and music player can be installed independently, providing more flexibility and convenience. 3.Music Variety: Self playing music can be selected based on store style and preferences, creating a personalized experience for customers. 4.Efficient Power Saving: The infrared sensor accurately detects visitors, saving energy and prolonging battery life, eliminating the need for frequent battery replacement. 5.Easy Installation: No complicated skills required, simple installation allows the store to have a professional and efficient welcoming function. Specification: Item Type: Infrared Sensor Doorbell_x000D_ Material: ABS_x000D_ Sensor: Battery type: Lithium battery, Battery model: 9V laminated battery x1_x000D_ Receiver: Battery type: Lithium battery, Model: AA battery x2_x000D_ _x000D_ Transmission Distance: Approx. 100 meters/328.1ft (in an open, unobstructed and interference free environment)_x000D_ Infrared Sensing Distance: Approx. 3-7 meters/9.8-23ft PackageList: 1 x_x000D_ _x000D_ Sensor 2 x Receiver 1 x Connector 1 x Base 1 x English User Manual