Connected doorbell and videophone - Universal - Electric doorbells, remote controls, wireless doorbells.(white) Strengths Universal Electric doorbells, remote controls, wireless doorbells.(white) Electric doorbell AC Remote Soolbell Trshome specializes in the producing high quality wireless doorbells, we sell wireless doorbells have CE and RoHS certification. Remote control range up to 150m in the open air, when used indoors, it will be affected by the wall thickness and amount, and the distance will be about 20-80 meters. Meet the needs of most residential and high-rise buildings. Easy to install with double side adhesive tape or screws. Learning code technology, buttons and receivers can be paired freely No fever, safer Improved IC circuit It will not heat up when plugged in for a long time. Better security.Designed to last up to 26 years Flashing LED Mute setting can avoid disturbing the baby's sleep. There is a LED flashing light reminder when guests ring the doorbell Easy installation No wiring required, no tools required You don't have to make any holes or damage anything. 1.plug the receiver into the socket 2.Adhesive tape or screw on the reverse side of the back of the button 3.stick the button on the outside wall Reminders: The button cannot be placed on an iron door as it will interfere with the signal . Contact customer service to ask for installation video details Instructions Parameters Receiving distance: 150m (in open area) Waterproof: IP44 Ringtones: 51 pcs Volume: 4 steps (can mute) Button power: self-powered Battery power receiver: AC (110V - 250V) Working frequency: 433 MHz