Features: 1. Built-in 16-36 chord ringtones, the sound is loud and clear. 2. The remote control distance is long, up to 100 meters (with no obstacles). 3. Power saving, the battery of the transmitter can be used for one year (calculated as 20 times per day). 4. Use battery power supply, safe 5.High quality luxurious doorbell which is fashionable and exquisite in appearance can produce beautiful and pleasing ringtone. 6.Small size, easy wall-mounted installation, just attach to the wall with self-attached double-sided adhesive tape. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: Power mode: DC Power supply voltage: 3.0 (V) Scope of application: home Type: Remote control doorbell includes: 1x Doorbell