General description This wireless doorbell features 52 melodic ringtones from around the world, easily changeable with the push of a button. It offers four adjustable volume levels, including a silent mode, and a blue flash indicator that lights up in silent mode to meet your different needs. Technical specifications Range: 400 meters (in open area) Waterproof and dustproof: IP44 rating Operating temperature: -35°C to 65°C Installation The signal receiver comes with a plug for easy power connection. Includes double-sided tape and screws for fixing the transmitter (button) in your desired location. Usage Automatically saves the ringtone and volume settings. Restarts with previous settings after a power outage or unplugging. To re-pair the transmitter and receiver, press and hold the volume button on the receiver while pressing the transmitter; pairing should be successful within 3 seconds.