[The innovation of science and technology]- ISO code function with the same frequency of innovation, to avoid mutual interference between neighbors or false ringing. Can adjust the volume size, according to the different environment and different groups of people to adjust the volume (suitable place: rent house, family, hospital, school, company. Suitable Population: the elderly, children, disabled, pregnant women, patients :as for call ring)

[Waterproof and Dust-proof]-The IP55 waterproof and dust-proof work around the clock, the personalized cue card.The moist environment are not afraid of failure or decreased the sensitivity of the doorbell.

[Ringtone come your ear]-A wide selection of 55 melodies allows you to easily choose one to suit your preferences - enough for a new tune every week of the year, so you will never get bored with your doorbells chimes again. It is easy and simple to choose your favorite melody.The built-in 40 mm stereo speaker delivers clear and well-balanced sounds.And smart LED flashing lights to point ( when the receiver light means mute);5-Level Cycle Adjustable Volume from 0db to 110db

[Long wireless range]-Signal penetration strong, when no obstacle, the largest bell signal reception range of more than 300 meters.And it is certified by CE, FCC, PSE, and RoHS.

[Product warranty]-As a company focused on quality, we are very confident in the product, as long as you are satisfied ,we promise 18 months warranty.