Easily connect and swap hard drives and solid state drives to and from your computer system with the added benefit of a built in cooling fan this usb 30 and esata docking station makes it easy for you to connect and swap your 25in or 35insatahard drives hdd and solid state drives ssdthe docking station also has a built in fan that keeps your drives running at an optimal temperature for peak performance and longer drive lifespan with support for either usb 30 or esata host connecti