12 Ringtones Optional: The doorbell has 12 kinds of string sounds optional, will not always hear the monotonous doorbell. And the volume is adjustable. Multifunctional: Our video intercom system supports speakerphone function, electronic unlocking function, monitoring outdoors, night vision infrared function and adjustable image brightness, chroma and volume. Waterproof Outdoor Panel: Aluminum alloy outdoor unit with anti oxidation and wear resistant treatment. With 92 wide viewing Angle, you can see the details of visitors, infrared night vision, clear observation of visitors day and night. 7 inches Color Video Screen: Our indoor unit screen is a 7 inches TFT LCD with a resolution of 480 x RGB x 234, no radiation, low power consumption, and can see high definition widescreen color images. Wall Mounted Installation: Stable wired connection, clear vision, home security. Stylish, beautiful design. It can be used for apartments, villas, hotels, offices, public buildings