Easy to install: Simply plug the receiver into the power outlet, and then use the provided screws or adhesive to connect the transmitter to the exterior wall. Receiving distance, strong penetrating power: The receiving distance can reach 200 meters and will not interfere with other devices in your home or neighbors. Never miss a visitor. Alarm: 58 musical alarms, you can choose 4 levels of adjustable volume. When the button is pressed, the doorbell transmitter and receiver will flash at the same time Waterproof and energy-saving transmitter: The remote control button adopts ultra-low power consumption design, IP44 waterproof and dustproof Product parameters Product material: ABS environmental protection plastic Transmitter waterproof rating: IP44 Receiver rated voltage: AC 110-240V, 50-60HZ Controllable receiver: 50-100dB, 4 levels adjustable Operating frequency: 433MHz Standby power of the receiver: