describe long operating distance With reliable wireless range and strong signal penetration, the doorbell will never fail to alert you when someone comes to your door. Enjoy a reliable, hassle-free doorbell system in homes, factories, offices, classrooms, apartment buildings, villas, and other large spaces. 45 melodies to choose from You can choose from 45 different music ringtones, choose a different one every day! The wireless doorbell also has 0-90db 4-level adjustable volume to meet your needs. IP44 waterproof and dustproof The transmitter has IP44 dustproof and waterproof rating, and the working temperature is from -20 to 65, so there is no need to worry about bad weather conditions, such as sun, rain, dust, snow, frost, etc. Self-powered remote control button When you press the button on the doorbell transmitter, it converts the kinetic energy into an electrical signal that wirelessly knocks on your door. No battery required. silent mode Silent volume levels provide distraction-free notifications without worrying about the doorbell receiver ringing to disturb a sleeping baby or a hearing-impaired person. LED indicator When you press the transmitter and receive a signal, a melodious bell and LED flash. For the hearing-impaired, a flashing light with an audio alert indicator is easy to notice. easy to use Simply stick the wireless doorbell next to the door using the included double-sided tape, or attach the doorbell to the wall with screws. Then plug the receiver into a power outlet. Compact and elegant design A wireless doorbell adds an elegant finishing touch to your decor. Its sleek and modern appearance allows it to find its place in all environments. best gift Widely used in home, office, hotel, villa, hospital, office, apartment, school and other applicable areas. It is the best gift for family, friends and loved ones. Great for hearing impaired people. become very rich