StarTech.com 2 Port 54mm ExpressCard RS232 Serial Adapter Card with 16550 UART EC2S55254 High-performance single-chip design optimizes speed, reliability, and power, while reducing CPU load by as much as 48% over conventional (bridge chip) adapters Full width 54mm ExpressCard is the perfect fit for business laptops, ensuring a long life without damaging the card, or your computer The included breakout cable spreads/spaces out the 2 serial ports, to avoid crowded peripheral connections Two 16C450/550 compatible UART serial ports Supports baud rates up to 128000bps 256 Byte deep transmit/receive FIFO Breakout cable included Fully compliant with PCI Express Base Specification Revision 1.0a