Linksys usb3gig gigabit ethernet adapter connector 1x rj 45 additional connectors 3x usb 3 0 the linksys usb ethernet adapter usb3gig is the perfect solution for the business traveler that prefers the speed of gigabit ethernet to wi fi simply connect the usb3gig to your mac book air chrome book or ultra books usb 3 0 port and the ethernet port to a router to get an ultra fast wired connection with the gigabit port youll get high speed data transfers which is great for downloading