2PCS ABS Wireless Waterproof Doorbell

2PCS ABS wireless waterproof doorbell, long distance reception, barrier-free penetration Specification: Material:ABS Color:White Plug:EU/US/UK Plug-in( AU adapter) Receiver voltage: AC110-240V Volume:5 Files(Include mute) Waterproof: IP44(Transmitter) Remote Range:300 meters in open area Transmitter power: 12V23A alkaline battery(not included) If the receiver does not ring when you press the button after you receive the doorbell. Pls check the following steps: 1. Whether the button has installed the right battery , it requires an alkaline battery of 23A12V( not included) 2. You can pair the button with the receiver. How to pair signals? Press and hold the volume button on the receiver for about 5 seconds (the light is on), release the volume button, then press the button immediately, the signal is successfully paired.