1,Self Generating Doorbell: When you press your finger, the kinetic energy is converted into electric energy, free of wiring, no battery. 2,Adjustable Ringtones: 38 ringtones, includes classic doorbell tones and music tones, and 4 level adjustable volumeto meet your personalized needs. 4,Weatherproof: The wireless doorbell is made of ABS material, which is resistant to high and low temperature, waterproof, and effectively prolongs the service life. 5,Wide Application: Doorbells are widely used, can be used in homes, villas, hotels, factories, as well as the elderly, patients, pregnant women, etc., one click call to protect the safety of family members. 3,Long Range: The wireless doorbell signal has strong penetration, can penetrate 3‑4 walls, and the longest transmission distance in open areas can reach 200 meters. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.