Feature: 1. High Sensitivity: Doorbell uses a unique infrared body sensing technology, strong sensitivity, so that the doorbell can perceive the person outside the door in real time. 2. Split Design: The alarm and horn can be separated for any doorbell location needs. The receiving distance in open environment can reach 200 to 300m 3. Multilingual Broadcasting: You can set guest greetings or alert messages based on the selected broadcast language, no need to worry about inappropriate language. 4. Clear and Adjustable Sound: Premium speakers provide clear, loud sound, ensuring that they can be heard even in noisy environments. And there are 4 levels of volume adjustable. 5. Wide Application: Doorbells with welcome announcements are ideal for commercial use and can be widely used in supermarkets, shops or homes to provide safety and convenience. Specification: Item Type: Infrared Sensor DoorbellMaterial: ABS Battery Type: Lithium battery Battery Model: 1.5VAAA x 3 (Shipped without batteries) Receiver Working Current: ≤60mA, static current: ≤7mA; Power: ≦2W; Music: 36 chords to choose from; Operating Frequency: 433MHZ; Remote Control/Receiving Distance 200-300m(open area); Transmitter Operating Frequency: 433MHZ; Transmitter Operating Current ≦12mA LED Indicators: the transmitter senses people, the LED indicator of the transmitter lights up, the transmitter works, and the receiver receives instructions, and also emits beautiful music to remind you that there is a VIP visit, and the LED light on the receiver is also accompanied by regular flashing music; Temperature Resistance: -10℃~50℃ . Package List: 1 x Transmitter 1 x Receiver 1 x Connector1 x Base 2 x Screw 2 x Expansion Bolt1 x English Manual