Year-End Clearance Sale! This is a USB 3.0 switch used as a secondary device in a studio. It's a convenient device that allows you to switch between 4 external devices and 2 PCs/Macs with a single button press. An optional AC adapter and cables are included, so you don't have to worry about using devices that require a lot of power. The main body is made of metal, not cheap plastic, and has excellent heat dissipation. It will be carefully packed and shipped. Stored in a smoke-free, pet-free environment. It is a beautiful, working product, so returns are not accepted.