Features:Innovative waterproof design, prevents the doorbell from rain and water, to prolong the service time. 4 levels of adjustable ringing volume, can be setted to meet your needs. Made of high quality ABS plastic material, reliable, economical and environmentally friendly.With wireless installation, it is simpler and more convenient.Up to 50m remote control/receiving distance, can minimize the probability of wrong codes.Specifications:Material: ABS plasticColor: As the picture showPower: 2WControllable Volume: 25~80dB (4 levels of adjustable volume)Remote Control/Receiving Distance: 50m (in an open area)LauncherBattery Model: 23A 12VWorking Current: 15mA (calculated 20 times a day, a high quality battery used for a year)ReceiverPackage List:1 * Outdoor Unit (With a Built-in12V23A Battery)1 * Indoor Unit1 * Rubber Pad2 * Screws1 * User Manual