Astrotek 4-port USB2.0 PCMCIA Card, with Built-in 5V Power Step-up Switching power supply for sufficient current supply to all USB Ports, Cardbus type 2 (54mm), 32bit, 3.3V, Chipset : VIA, 4 x USB 2.0 High Speed Port, Max. 480 Mb/s transfer rate per port, USB specification rev.2.0 compliant, USB EHCI specification rev.1.0 compliant, USB UHCI specification rev.1.1 complaint, Support Hot Plug, Drivers support Windows 98SE or above, High Quality Stainless Steel Metal Case