USB interface allows you to quickly add another parallel port to your Windows 98/ME/2000/XP/Vista/7 computer Plug and play USB design eliminates the need for manual or automatic parallel switch boxes Compact size and low weight make it an ideal accessory for portable computers Fully Plug & Play for easy installation USB bus-powered operation, no external power adapter required Supports Windows 98SE/2000/XP(32/64bit)/Vista(32/64bit)/7(32/64bit) Eliminates the need for manual or automatic parallel switch boxes