Features: 1.Accurate Motion Detection: Equipped with a highly sensitive sensor, this infrared sensor doorbell can accurately detect every movement of a person. 2.Intelligent Voice Prompt: Featuring smart voice alarm function, this doorbell provides friendly voice prompts when someone enters, enhancing the user experience. 3.Wireless Connectivity: This infrared sensor doorbell utilizes wireless transmission technology, eliminating the need for complicated wiring and ensuring easy and convenient installation. 4.Alarm Function: With built in alarm capabilities, this doorbell instantly triggers an alarm to alert store owners or employees when an abnormal situation occurs. 5.Commercial Welcoming Device: Specifically designed for commercial environments, this infrared sensor doorbell can be widely used in shops, offices, and more. Specification: Item Type: Infrared Sensor Doorbell_x000D_ Material: ABS_x000D_ _x000D_ Transmitter Battery: AAA lithium battery x3 PackageList: 2 xTransmitter 1 xReceiver 2 x Connector 2 x Base 4 x Screw 4 x ExpansionBolt 1 x Instruction Manual