I-O Data's "CardBus Compatible USB 2.0 Interface PC Card CBUSB2" A PC card for adding USB 2.0 ports to a notebook PC's CardBus slot. Supports high-speed data transfer with a maximum transfer speed of 480Mbps. Includes Windows standard drivers, making it easy to use with a notebook PC. Model numbers are "CBUSB2" or "CBUSB2A". This item was purchased used over 10 years ago. Operation was confirmed on a Debian-based Linux system just before listing, but I recall it frequently freezing when I tried to use it on a Windows machine I owned several years ago. This may be due to compatibility issues. Please purchase only if you understand the above. Immediate purchase is welcome. Thank you for viewing.