SIIG Dual Profile Hi-Speed USB 4-Port PCI Adapter (JU-000042-S1) Adds 4 Hi-Speed USB 2.0 (480 Mb/s) ports to your system--with full backward support for USB 1.1 devices Installs in standard height or low profile system chassis Works with a variety of USB 2.0/1.1 devices including hubs, data storage devices, PC video cameras, digital cameras, CD-R/RWs, DVD-RAMs, scanners, printers, CF/SM/SD/MMC/Memory Stick memory card readers, and more Hot-swapping feature allows you to attach/detach USB devices without first powering your computer off Product dimensions: 5.24 (W) x 4.72 (H) x 0.79 (D) Warranty: Lifetime limited