The usb31000sptb usb 30 to gigabit ethernet adapter lets you add a gigabit network port to your laptop or ultrabook computer through a usb 30 port and features an integrated usb 30 pass through port that keeps your usb port available for use with other peripherals the rj45 port supports 101001000 mbps ethernet and is fully compatible with ieee 8023iuab standards the network adapter is the ideal laptop accessory for your microsoft surfacetrade pro 4 surface pro 3 surface 3 surface pro 2 or surf