S SELDORAUK Dog Barking Alarm Motion Detector,Pir Wireless Human Body Doorbell,Home Security

(The Doorbell devices have 3 working modes: 1)Flashing doorbell 2)sounds 3)sounds+flashing doorbell. 1 Sensor +N Receiver or N Sensor +1 Receiver can match by hand in code match in battery cover ，433mhz transmitter and receiver waterproof wireless doorbell motion sensor device to make a watch dog sound security system.