1 to 2 PIR Infrared Sensors Wireless Doorbell Alarm Detector for Home / Office

Features1. Brand new and high quality. 2. Adopt advanced infrared detect technology. 3. No wiring design makes it simple to use and easy to install. 4. Up to 100m Wireless working distance in open area 10m for indoor use. 5. Wireless installation just place the sensor at the entrance. 6. The receiver volume is adjustable 7. The Receiver will Send chime sound and illuminate red LED lights when the PIR devices detect somebody is near. 8. Sensor transmitter with installation brackets convenient to adjust detect angles as need. 9. It is perfect for home office or commercial buildings. 10. The receiver is powered by 2 x AA batteries (not included) and the PIR Sensor is powered by DC 9V (1 x 6F22 not included). 11. Support 1 Receiver and 2 Transmitters work as one group.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 t