KVM Switch 4 Computers HDMI Display port KVM Switch allows 4 PCs or laptops to share 3 monitors and 4 USB devices such as keyboards, mouse, printers, scanners, USB sticks, etc. For users with 4 PCs, this is a great way to save money and space. It makes your desktop neater and more productive.Note: Each computer must be equipped with 2 DP and 1 HDMI port for proper operation; use of conversion cables or adapters may result in erratic/flickering transmissions or failure to transmit images (device will intermittently disconnect) Control Switching The KVM switch uses buttons on the panel to control switching in addition. It also supports control switching. 1. The 4 buttons on the body that allow you to switch from PC1 to PC4 instantly without having to press it twice; 2