Add two USB (Universal Serial Bus) 3.0 ports to your laptop through an Express Card slot. The ECUSB3S2 Express Card USB (Universal Serial Bus) 3.0 Adapter lets you add two USB (Universal Serial Bus) 3.0 ports to your laptop through a 34mm Express Card slot. Enhanced with UASP support (USB Attached SCSI Protocol), this USB (Universal Serial Bus) 3.0 controller performs up to 70% faster than conventional USB (Universal Serial Bus) 3.0 when paired with a UASP supported enclosure (Note: UASP requires a compatible operating system). Using a more efficient protocol than the traditional USB (Universal Serial Bus) BOT (Bulk-Only Transport), UASP technology optimizes transfers by allowing multiple commands to be processed simultaneously, significantly increasing transfer speeds for less wait time on data transfers. Featuring a native NEC host controller chipset, the USB (Universal Serial Bus) 3.0 Express Card adapter is compliant with USB (Universal Serial Bus) 3.0 standards for data transfer speeds up to 5 Gbps, while still offering backward compatibility with existing USB (Universal Serial Bus) 2.0 / 1.1 devices. UASP is supported in Windows 8, Server 2012 & Linux kernel 2.6.3 or later. In testing UASP performed with up to a 70% faster read / 40% faster write speed over traditional USB (Universal Serial Bus) 3.0 at peak performance. At the same peak in testing, UASP also showed up to an 80% reduction in required processor resources. Test results were obtained using an Intel Ivy Bridge system, Star Tech.com add-on USB (Universal Serial Bus) 3.0 cards, a UASP-enabled Star Tech.com enclosure, & a SATA III solid state drive.