1. 4 Port-- Used to share 4 USB or for -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, , heat-, it expands the life of the USB switch. 4. Easy to operate--Plug-and-Play design be easier to use, no app is needed. 5. Others--Compact design reduces office expenses and saves a lot of space. This 4-Port 4K HD KVM Switch - One set of keyboard and mouse control 4 hosts Laptop or game console. Help you save the desktop space and equipment spending. No more hassle to swing your chairs at work, increasing the productivity. (4HD Input to 1 HD Monitor, projector or HDTV) Remarks: 1) standard 104-key wired USB keyboard, standard 2 or 3 button wired USB mouse are recommended. 2) Hot-key control on keyboard is not supported. 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 mission without lag, no loss of picture and sound quality. USB mission technology mouse and keyboard without delay. Metal shell, wear-, high temperature , good heat dissipation. Specifications: 4x1 Color: Black Material: Aluminum Alloy Package Contents: 1set * 4K USB HD KVM Switch 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.