?Stable work?KVM includes 12V power adapter.(the current provided by the PC host is small, and it cannot support USB devices such as hard disks). With the external power design, USB devices can obtain a stable working environment through the switch. If you have any questions during use, please contact us. We have a professional technical team to help you solve your difficulties. Within 12 months, we will replace the switch for free. ?KVM switch 2 switch mode?HDMI KVM switch 2 in 2 out supports panel button and external wire controller switching, one key to switch between two signal sources. Note: This dual monitor KVM switch requires your computer to have dual graphics cards (2 HDMI output ports) and support copy, extend mode. If your computer only supports a single monitor, this product will not help you get dual monitor functionality. NOTE: Keyboard shortcuts (hotkeys) toggles are not supported. ?HDMI KVM USB 3.0 Switch?In addition to two HDMI ports, this KVM switch also has four USB 3.0 ports with a data transfer rate up to 5Gbp/s, which is 10 times faster than USB 2.0 ports. USB 2.0 devices are compatible. It can be used to share USB devices such as printers, scanners, webcams, wired or wireless keyboards and mice, and more. Use of high-power USB devices requires use of the supplied 12V power supply. Support Windows/Vista/XP and Mac OS, Linux and Unix and other operating systems. ?Stunning Visual Effects?This 8K HDMI KVM switch supports resolutions up to 8K@60Hz and 4K@120Hz, providing an incredible viewing experience with stunningly lifelike images and vibrant colors. It is also backward compatible with 4K60@Hz, 1080P or lower resolutions for compatibility with various HDMI devices. ?Dual Monitor KVM Switch? This dual display KVM Switch allows you to use a set of keyboard and mouse to control 2 computers, share 4 USB devices and 2 monitors and support copy mode and extension mode (requires your computer to have 2 HDMI port) copy mode: two monitors output the same picture, extender mode: two monitors output different pictures.