1. 4 Port-- Used to share 4 USB or for HDMI-compatible peripheral devices(like scanner, USB hard drive or other USB devices) without having to constantly change cables. (Using only 1 set of keyboard, mouse and monitor to control 4 PCs)2. Mouse Keyboard Sharing-- Using only 1 set of keyboard, mouse and monitor to control hosts Laptop.3. Material--The shell made of aluminum alloy material, anti-oxidation, heat-resistant, it expands the life of the USB switch.4. Easy to operate--Plug-and-Play design will be easier to use, no app is needed.5. Others--Compact design reduces office expenses and saves a lot of space.Four hosts share a set of display / keyboard and mouse to improve work efficiency.4K@60HZ clear picture quality. Support 4Kx2K high-definition resolution clear and detailed display.Easy switching, neat desktop. High-speed transmission without lag, no loss of picture and sound quality.USB transmission technology mouse and keyboard without delay.Metal shell, wear-resistant, high temperature resistant, good heat dissipation.Material: Metalcolour: blackPackage Contents:1 x HDMI KVM Switch1 x Desktop Controller4 x USB cable1 x Chinese and English instruction manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.