General description This wireless doorbell features the latest RF push and battery-free technology, making it self-powered and environmentally friendly. It eliminates the need for wires or batteries, saving you money and hassle. The doorbell generates electric current when the transmitter is pressed, sending a stable signal to the receiver. With a range of 152 m (500 feet) through multiple obstacles and up to 305 m (1000 feet) in open terrain, you can be assured of reliable performance without interference from other devices. Technical specifications Transmission power: Automatic power supply Doorbell receiver power supply: AC 110-240 (V), 50/60 Hz Receiver power consumption: 0.25 W Ringtones: 38 melodies Volume levels: 4 levels Transmission range: up to 152 m (in open area) Operating frequency: 433 MHz Operating temperature: -4°C to 140°C Installation Installation is straightforward: simply plug the receiver into a power outlet and attach the transmitter to a wall. No complex setup