USB port adapter which supports all standard serial & parallel devices Compatible with USB (Universal Serial Bus) 2.0 & USB (Universal Serial Bus) 1.1 devices " Plug & Play" Connectors: USB (Universal Serial Bus) A Male to 9 Way D Male & 25 Way D Female Powered from USB (Universal Serial Bus) Bus with no external power supply required Cable length: 0.7m Compatible with Windows ME/2000/XP/ Vista & 7 (32 bit only), Mac OS 8.6 This USB (Universal Serial Bus) to serial & parallel converter cable allows a USB (Universal Serial Bus) ready computer to connect to 9-Way serial RS-232 & parallel peripheral devices simultaneously using a single USB (Universal Serial Bus) port.