1. No wiring, easy to install 2. Long distance, open up to 70-110M 3. High frequency vibrating body, strong penetration ability 4.32 music ringtones optional 5. When the music sounds, the LED lights flash at the same time. 6. Various styles to choose from. Specifiction: Receiver: 2 AA batteries (not included) Transmitter: 1 12V23A battery (supplied) Frequency: 315Hz Receiver: 3V/50-60HZ 2W Transmitter: 12V/23A Material: ABS Features: Self-adhesive, LED flash, 32 music Specifications: 1. Pleasing to the ears: 32 kinds of domestic and foreign famous chord ringtones are available for selection, the volume can be adjusted according to the needs, and the joy of visiting relatives and friends can be felt; 2. Fashion design: Incorporate fashionable design elements, beautiful shape, vivid your home environment; 3. Easy installation: DIY wireless design concept, eliminating the need for traditional doorbells such as wiring, chisel installation and other cumbersome processes 4. Extra long remote control: The effective remote control distance of 100 meters (open area) can meet the installation and use of various houses. Package Included: 1x Doorbell receiver 1x Doorbell transmitter Notes: Precautions When installing the doorbell, it should not be close to metal objects, so as to avoid the metal magnetic field affecting the use effect of the doorbell; Buttons and doorbells are paired and used with the same frequency code. Do not use unpaired buttons for operation; Do not install the doorbell or button in the place where there is sunlight and rain; Try to use high-quality alkaline batteries, and regularly check whether the battery leaks