USB card reader *support usb2.0 *powered by usb connection cable *no external power required *led light clew read and write state *fully plug & play and hot swapping support high-speed data transfer *convenient for carrying, antiseismic, high temperature resistance *support: win98/me/2000/xp/mac os *support usb2.0 *powered by usb connection cable *no external power required *led light clew read and write state *fully plug & play and hot swapping support high-speed data transfer *convenient for carrying, antiseismic, high temperature resistance *support: win98/me/2000/xp/mac os