Item Type:Infrared Detector Alarm Model: MS-YBQ04 (2* Infrared Sensor + 1* Receiver) Power Supply Receiver host: 3*AA battery( Not included ) or micro USB, Infrared sensor: 3* AAA battery( Not included ) or micro USB, Frequency: 433MHz Transmission Distance: 280m(Open Area) PIR Sensor Angle: 100 degree(horizontal);15 degree(vertical) Sensor Range: 2~8m Volume: 4 level Brightness: 4 level Working Environment Temperature: -10?~60? Package List: 2* Infrared Sensor 1* Receiver 1* Bag of Mounting Screws 1* User Manual(English) Note: The AA battery for the receiver and the AAA battery for the PIR sensor is not included in the package. Mengshen If for any reason you are unhappy with any product by Mengshen, please do not hesitate to contact us. We take full ownership and responsibility for the quality of our products and will do our very best to solve your problem quickly and efficiently!