describelong operating distanceWith 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 fromYou 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 dustproofThe 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 buttonWhen 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 modeSilent volume levels provide distraction-free notifications without worrying about the doorbell receiver ringing to disturb a sleeping baby or a hearing-impaired person.LED indicatorWhen 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 useSimply 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 designA 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 giftWidely 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