DescriptionThe Wireless Infrared Doorbell is a set of infrared sensing electronic guard, which includes one wireless transmitter and one wireless receiver. The transmitter makes use of infrared sensing technology to detect almost every movement and send a signal to the receiver from up to 100m away. You can clearly know your family members who are leaving and coming, and help to detect unwanted people.Features:- Color: White.- Material: Plastic.- Size: Approx. 17.5 x 11 x 7.5cm.- Support Welcome/Doorbell/Alarm mode - Welcome mode applicable to business services, doorbell mode uitable for family courtyard and door, alarm mode use as burglar alarm system.- Receiver host: 2*AA battery(not included), saving design so that its battery have long lifetime- Classic songs can be choose - Classic and great music makes people happy.- Large range of Infrared induction - Up to 100 meters detection range.Specifications:- Power Supply: Receiver host: 3 x AA battery(not included); Infrared curtain: 1 x 9V laminated cell (not included).- Frequency: 315MHz.- Transmission Distance: 100m(Open Place). - Sensor Range: 3-7m.- Receiver host voltage: DC 3V.- Infrared curtain voltage: DC 9V.