【4 PORT HDMI KVM DUAL MONITOR】This kit help you use one set of keyboard and mouse to control 4 computers and share 2 monitors, you can switch anytime. It requires every computer support 2 screen or above display functions. If your computer supports this function and only one HDMI output, you can use a converter or conversion cable, such as VGA to HDMI converter or conversion cable, DVI to HDMI converter or conversion cable etc. | 【UHD 4K@30Hz】 Support 4K@30Hz/3D/1080P resolution, make the image display more exquisite and realistic. You can enjoy the most luxurious video with this HDMI KVM dual monitor Switch. It support HDMI 1.4 and HDCP 1.2 protocol. | 【POWERED BY USB】It means powered by USB cables, no need external power adapter, just connect you switcher devices to enjoy, it make you work and life easier and simpler. Come with 1 Micro USB power cord for power supply (Please remember to turn on the switch when using). | 【HOTKEY SWITCH】You can choose hotkey switch (Click 2 times "scroll lock" and then click 1/2/3/4, or Click 2 times "Ctrl" and then click 1/2/3/4), you also can switch the 4 signal sources by the panel buttons, the status light tells you which port is active. Special Note: Hotkey switching is not supported when the keyboard and mouse use the USB 2.0 port. | 【PLEASE NOTE】Please note that in the premise that the supports dual display or multi-screen display, the extended mode can output two different screens, and the mirror mode can output two identical screens; If your computer only supports single display, then this product cannot help you get dual display function. Please make sure that all cables are connected tightly, and make sure that all cables are good. If you have any questions about the product, welcome to contact us.