... a ExpressCard slot Compatible with PC & MAC systems USB TO EXPRESS card1,USB interface,Support hot-swappable2,Provide a ExpressCard slot, supports ... ExpressCard 34/54mm PC Card3,Support USB interface design ExpressCard PC cards, USB expansion cards, for example, EV-DO (3G ... and MAC systems6,Power use: DC +5 V7,NO driver USB to Express Card High Quality