Wireless doorbell, transmitter operating with an electromechanical converter without requiring the use of batteries. It has a range of up to 80 meters, waterproof button with IPX7 protection, radio transmission (frequency 433MHz). It features 3 volume adjustment levels with full mute, sound level 30–110 dB, 25 polyphonic doorbell sounds to choose from, and 2 signal modes (visual and acoustic). The number of cooperating buttons can be increased as needed and it has a learning system (automatic connection) without requiring doorbell installation.