Features: 1.5 Functions: The wireless doorbell has five function reminders, such as welcome, doorbell, alarm, colorful lights, and night light 2.Humanized Design: The commercial door bell has colorful LED lights, with regulable brightness, regulable volume, battery replacement memory and other humanized design 3.Long Distance Transmission: The infrared doorbell can transmit long distance, up to 280 meters in open spaces, suitable for larger places and higher floors 4.40mm Speaker: The motion sensor doorbell adopts independent alarm 40mm speaker, 8 chord music chip, the maximum is 113dB 5.Sensing Angle: The infrared doorbell senses 100 degrees horizontally, 15 degrees vertically, 2 to 8meters sensing distance (related to ambient temperature) 6.Scope of Application: The infrared doorbell is suitable for various shops, clubs, hotels, offices, factories, homes, villas, etc specification:Item Type:Wireless Doorbell Material: ABS Transmitting and Receiving Frequency: 433.92MHz Ambient Temperature:Receiver: -10 to +60 Infrared Detector: 10 to +33 Working Environment Humidity: