Description:Easily add two fast Firewire 1394b ports to any Windows based system with PCI-e slot. Great for mass video/audio data transfer applications.Features: Simultaneous Operation of Multiple High-performance Devices Supports Hot-swapping and Plug-n-Play Connection of Peripheral Devices Works with Various Types of FireWire 800 (1394b) and 1394a Devices Including Portable Hard Disk, DV Camcorder, Digital Camera, CD-RW/DVD-ROM Drive and Other Audio/Video Devices 1-Lane (x1) PCI-Express with Transfer Rate 2.5Gb/s Full Duplex Channel Support Provisions of IEEE P1394b Revision 1.33+ Fully Backward Compatible to 1394a Specification Fully Interoperable with FireWire, iLink, and SB1394 Implementation of IEEE 1394 Standard