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. Description: 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: Metal colour: black Package Contents: 1 x HDMI KVM Switch 1 x Desktop Controller 4 x USB cable 1 x Chinese and English instruction manual Only 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.