CACAZI A10G One Button Three Receivers Self-Powered Wireless Home Cordless Bell, EU Plug. Pressing the switch generates kinetic energy, which is converted into electric energy, eliminating the need for battery replacement. This design is environmentally friendly and energy efficient. Strong signal penetration with a receiving distance of up to 120 meters in a straight line. Features 38 selectable melodies with 3 volume levels, allowing users to choose music and adjust sound to preference. The transmitter has a waterproof design meeting IP44 standard, protecting against rain and extending product lifespan. Doorbell system: the transmitter generates power when pressed, and the receiver connects directly to power via plug. Operating voltage: receiver works with 110-240V. Transmitter dimensions: 77x45x25mm. Receiver dimensions: 95x65x24mm. Suitable for use in homes, residential areas, offices, hospitals, restaurants, factories, and other commercial or residential buildings.