General description This wireless doorbell features the latest RF push and battery-free technology, eliminating the need for wires or batteries. It generates its own power when the transmitter is pressed, sending a stable signal to the receiver. With a range of 150m (500 feet) through multiple obstacles and up to 305m (1000 feet) in open terrain, this doorbell ensures you won't miss any visitors, even from different rooms or floors. Technical specifications Power supply: Battery-free operation Range: Up to 152 m (500 feet) with obstacles, up to 305 m (1000 feet) in open terrain Ringtones: 38 different options Volume levels: 4 levels including mute Installation Plug the receiver into a power outlet Attach the transmitter to a wall using the included accessories (2 screws and adhesive tape) Usage This wireless doorbell is suitable for various settings including homes, apartments, schools, country houses, and offices. It also features a memory function that retains your last settings