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