The ECUSB3S11 Flush Mount 1-Port USB (Universal Serial Bus) 3.0 Express Card adapter uses a unique form factor design that allows it to sit fully in a standard 34mm laptop Express Card slot without sticking out. The port sits virtually flush with the sides of the laptop, becoming an add-on that can be left installed, even while on the move, without fear that it will get snagged or hit against which could cause damage to the card or slot. The USB (Universal Serial Bus) 3.0 Express Card adapter supports data transfer rates up to 5 Gbps, & is still backward compatible with USB (Universal Serial Bus) 2.0 at up to 480 Mbps, or USB (Universal Serial Bus) 1.1/1.0 at up to 12/1.5 Mbps respectively. The Star Tech.com Advantage Eliminate the worry of snagging or hitting the Express Card with a unique Flush Mount design Increase productivity with Super Speed USB (Universal Serial Bus) 3.0 connectivity, while remaining backward compatible with USB (Universal Serial Bus) 2.0/1.x devices Power many USB (Universal Serial Bus) devices without the need for an external power adapter