Brainboxes PCMCIA Dual RS422/485. Host interface: PC Card 16-bit. Data transfer rate: 921600 Mbit/s. Width: 85.6 mm, Depth: 54 mm, Height: 5 mm. Connectivity technology: Wired, Compatible operating systems: Windows server 2003 x32 bit & x64 bit/ Windows XP x32 bit & x64 bit/Windows 2000