Product Name: 7-inch color visual extension Product Model: QK-W40C-7T ■ host and management center alarm call, intercom, surveillance, the song chord tone ringtones ■ image brightness, contrast adjustment, visitors call extension, the extension automatically show the images of visitors, after 60 seconds will automatically enter the waiting state. Hands-free duplex call, unlock function ■ optional features: motion detection recording, camera functions, information publishing, security alarm function (gas, infrared, smoke, door and window magnetic, emergency buttons, etc.) ■ Material: PVC + brushed aluminum The decorative surfaces ■ transmission mode: single cable screen (Display): 7 "TFT-LCD Backlight: LED display size (Dimension): 152.40 (H) X91.44 (V) resolution (Resolution): 800RGB (W a) X480 (H) system standard (System format): PAL / NTSC video input (Video input): 1Vpp 75Ω voltage input (Voltage input): DC 12 - 18V ± 10% (of typical 12V 130mA ± 20 mA) installation method (Installation ): Print (86 cassettes)