Startechcom flush mount expresscard adaptors startechcom ecusb3s254f the ecusb3s254f flush mount 2 port usb 30 expresscard adaptor from startechcom lets you add two usb 30 ports to your expresscard enabled laptopthe usb 30 card uses a unique design that allows it to sit flush in a standard 54mm laptop expresscard slot creating a seamless add on that can be left installed even while on the move without having to worry about impact damage to either the card or the expresscard slotenha