Features: ExpressCard is an interface to allow peripheral devices to be connected to a computer, usually a laptop computer. This USB Express Card aims at providing high-performance and modular expansion to both desktop and laptop by a lower cost and compact design. This laptop 2 port USB express card can support hot swap function!And this laptop 2 port USB 54mm express card can support USB3.0, USB 2.0 and USB 1.1. Do not miss this express card! One end is 2 port USB 3.0 type A female connectors and another end is standard 54mm ExpressCard. Operating systems support: Windows XP, Vista,Win7 and Linux Description: ExpressCard is an interface to allow peripheral devices to be connected to a computer, usually a laptop computer. This USB Express Card aims at providing high-performance and modular expansion to both desktop and laptop by a lower cost and compact design. And this serial port express card for notebook laptop is compliant with standard 54mm port. This laptop 2 port USB express card can support hot swap function! And this laptop 2 port USB 54mm express card can support USB3.0, USB 2.0 and USB 1.1. Do not miss this express card! Product Features? Supports a variety of high-power transmission speed. Supports Port: USB3.0/USB2.0/USB1.1 Tailored to port 900mA output current exceeds the current detection and protection Plug & play, Hot-swap and wake-up support equipment Operating systems support: Windows XP, Vista,Win7 and Linux One end is 2 port USB 3.0 type A female connectors and another end is standard 54mm ExpressCard. Bus-powered mode and no external power required for most of peripherals. Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package included: 1x Hidden USB 3.0 ExpressCard 54mm Adapter. 1x USB DC Cable