USB 3.0 Dual Monitor HDMI Switch for 2 Computers Advantages: Share one set of keyboard, mouse and dual monitors between 2 computers or laptops;Dual monitors output support up to 4K@60Hz for extended,mirrored or spliced display（Depends on your computer's graphics card.）;No complicated installation is required, and non-professionals can easily operate it;Cross support major operation systems including Windows, Linux, Mac and more;Switching modes: Buttons on the front panel and wired remote;The ports that need to plug in HDMI/USB cables are all hidden behind the KVM, so the desktop doesn't get cluttered;A USB hub can expand the USB3.0 ports if multiple connections are required;Audio Microphone output. installation steps: 1. Insert the adapter into the KVM ;2. Plug the HDMI cable into the KVM and monitor;(Output)3. Plug the HDMI cable and USB 3.0 cable into the KVM and your computer/laptop (HDMI cables are not included)(Input)HD IN1 A + HD IN1 B + USB IN1=PC1HD IN2 A + HD IN2 B + USB IN2=PC24. Insert the mouse and keyboard into the KVM switch5. If needed, you can connect a microphone and audio port Note： 1. Most of the reasons why only onevideo output works is because of incorrect connection. Please make sure eachcomputer have 2 HDMI cables connect to the KVM.2. If the KVM switch does not work, you can turn off the switch on the panel and turn it on again after 2-3 seconds, and it will return to normal. KVM Switch With 3 USB 3.0 ports 3 USB 3.0 ports, backward compatible with USB 2.0 and USB 1.1, share USB devices such as keyboard mouse scanner, printer, flash drive, etc.