FY-0256 2 in 1 PIR Infrared Sensors (Transmitter + Receiver) Wireless Doorbell Alarm Detector for Home / Office / Shop / Factory

Features1. Adopts advanced infrared detect technology. 2. No wiring design makes it simple to use and easy to install. 3. Long sensing distance. 4. 38 songs for choice in total you can choose the song throgh click the music key on the side of receiver. 5. 3 levels of volume for adjust you can adjust it by click the volume key on the side of receiver. 6. The receiver has the function to set voiced noiseless modes you need to adjust it by click the volume key on the side of receiver. 7. It is functional for home office or commercial buildings. 8. The transmitter is powered by 3 AA batteries the baterries are not included in this item. 9. Please install it refer to the tips described on the Enghlish/Chinese manual.How to use1. Open the sensor cover install 1 x 9V battery then opens the switch in circuit board 2. Open the receiver cover and you can install 2 x AA batteries 3. Push the switch on the side of receiver to open the switch 4. Install the sensor on the both of door