Simultaneously connect two RS-232 serial devices to your USB ready PC or Mac Supports all standard serial devices USB 1.1 Compliant Easy plug and play installation Connectors: 2 x 9 Way D Male to USB A Male High Quality FTDI Chipset Supports remote wake up and power management Data buffers for upstream and downstream on each port Powered from USB Bus with no external power supply required Cable length: 60cm Compatible with Windows ME/2000/XP/Vista/7/8 and Mac OS 9 or higher Warranty: 2 years