YIROKA Digital Wireless Doorbell (Encrypted Radio Signals System, 1 Door Chime - 1 Premium Touch Sensor Button Waterproof Remote Control) with 48 Chime Tones & LED Flashing Indicator Digital encrypted radio signals system, prevent interference from others / neighbors doorbells or radio signal devices; Energy efficiency design; Waterproof remote control (transmitter unit) Touch button operation; 48 different melodic sounds for selection; Plays ding dong chime; 4 levels of adjustable sound volume; Wireless transmission to master unit Sleek compact design easily blends with the decor of your home; No wiring or drilling; Easy installation; Wireless doorbell can be placed / carried with you anywhere you want; Hear the door chime in any room; Never miss a visitor or delivery again Useful in home, office, or commercial buildings; LED indicator flashes (chime main units) when bell rings; Advanced technology; New sounds; Premium quality; Double sided self adhesive tape included for remote mounting Dimensions: Doorbell main unit: 4.72" x 2.95" x 1.18" (120mm x 75mm x 30mm) Remote control: 3.86" x 1.57" x 0.79" (98mm x 40mm x 20mm); Power: Doorbell main unit: 3 x AAA batteries (not included) Remote control: 1 x 23A 12 V battery (included)