General description Easy installation with a long reception range makes this Wireless Doorbell an ideal choice for homes, offices, and hotels. With a waterproof and energy-saving transmitter, you can ensure that you never miss a visitor again. Technical specifications Transmitter waterproof rating: IP44 Receiver rated voltage: AC 110-240 V, 50-60 Hz Receiver controllable volume: 50-100 dB, 4 levels adjustable Operating frequency: 433 MHz Receiver standby power: