DCOT Home Doorbell 300M Remote CR2032 Battery Waterproof Transmitter US EU UK Plug Receiver 60 Rings 0-110DB Chimes

The button supports up to 8 pcs, and the receiver supports up to 100 pcs.
If multiple buttons are paired with or more receivers in the same system, each button can be set to a different ringtone.
Power-off memory function: Turn the power on again after power off, no need to re-adjust and lock the ringtone.
The transmitter has no screw chuck design, and it can be waterproof and dustproof without rubber .
Receiver voltage: 110-220V.

The receiver is available in a variety of plugs, US/EU/UK Plug and AU adapters, suitable for most countries.
Receiving distance:300 meters in opening area.
The signal will be affected by obstacles. The more obstacles, the more serious the signal loss.
Receiver has 5 levels(can be mute) 0-110db,60 music to choose from.
Size:Transmitter 86x86x10mm,Receiver 90x56x20mm.
NOTE:
The button cannot be placed on an iron door because it will interfere with the signal.
How to pair signals?
Pairing method: press and hold the volume button on the receiver for about 5 seconds (the light is on), release the volume button, then press the transmitter immediately, the signal is successfully paired.
The transmitter is installed outside the door, the receiver is installed on the power socket,