1、5 Functions: This wireless doorbell features five function reminders, including welcome, doorbell, alarm, colorful lights, and night light. 2、Humanized Design: The commercial doorbell has colorful LED lights with adjustable brightness, adjustable volume, battery replacement memory, and other user-friendly designs. 3、Long-Distance Transmission: The infrared doorbell can transmit over long distances, up to 280 meters in open spaces, making it suitable for larger venues and higher floors. 4、40mm Speaker: The motion sensor doorbell uses an independent 40mm alarm speaker, an 8-chord music chip, and reaches a maximum of 113dB. 5、Sensing Angle: The infrared doorbell senses 100 degrees horizontally and 15 degrees vertically, with a sensing distance of 2 to 8 meters (depending on ambient temperature). 6、Application Range: The infrared doorbell is suitable for various shops, clubs, hotels, offices, factories, homes, villas, etc. Item Type: Wireless Doorbell Material: ABS Transmission and Reception Frequency: 433.92MHz Ambient Temperature: Receiver: -10℃ to +60℃ Infrared Detector: 10℃ to +33℃ Working Environment Humidity: <80% Storage Temperature: -20℃ to +70℃ Receiver Battery: 3 x AA Batteries (not included) Infrared Curtain Battery: 3 x AAA Batteries (not included) Includes: 1 x Receiver, 2 x Infrared Curtains, 2 x Film, 2 x Screw Packs, 1 x Base, 2 x Universal Adjustment Brackets, 1 x User Manual