'DOUBLE H' 2.0 PCMCIA Card, 4 x USB2.0 ports, Plug & Play and Hot Swapping functions, Supports 32 bit CardBus PC Card Type II slots, All downstream facing ports can handle high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) transaction, supports Windows 98/2000/ME/XP and Mac OS 8.6.1 or above.