General description This wireless doorbell features the latest RF push technology and is battery-free, making it environmentally friendly and cost-effective. When the transmitter is pressed, it generates its own electric current and sends a stable signal to the receiver, eliminating the need for cables or batteries. With 38 ringtones and 4 volume levels, including mute, this doorbell allows you to customize your experience. It also has a memory function that retains your last settings after a power failure, ensuring convenience and ease of use. Technical specifications Transmit Power: Auto-powered Receiver power supply: AC 110-240 (V), 50/60Hz Receiver power consumption: 0.25W 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 Simply plug the mini receiver into a power outlet. Attach the transmitter to a wall using the provided mounting options. Usage This wireless