StarTech.com 4 Port ExpressCard RS232 Serial Card Adapter with 16950 UART EC4S950 Connect serial devices to any notebook with an available Express Card slot Supports the RS232 specification StarTech.com's Lifetime Warranty 128-byte deep FIFO data buffer Automated in-band flow control Offers 4 DB9 RS-232 ports to connect a serial device to a notebook with an available ExpressCard slot Automated in-band software flow control using programmable Xon/Xoff in both directions OS Compatibility:Windows 8 (32/64bit), 7 (32/64), Vista(32/64), XP(32/64), 2000,Windows Server 2003(32/64)