Features:1. Built-in 16-36 polyphonic ringtones, the sound is loud and clear. 2. The remote control distance is long, up to 100 meters (no obstacles). 3. Save power, the transmitter battery can be used for one year (calculated as 20 times a day). 4. Battery powered, safe5. High-quality luxury doorbell, stylish and exquisite, can emit beautiful and pleasant ringtones. 6. Small size, easy to wall-mount, just fix it on the wall by yourself - double-sided tape included. Note:Due to different monitors and light effects, the actual color may be slightly different from the imagePlease allow 1-3 cm deviation due to manual measurementInstructions: Power Mode: DC Power supply voltage: 3.0 (V)Application scope: householdType: remote control doorbellIncludes:1x doorbell