Today's computers don't come with parallel ports. But they do have USB! With this adapter cable you can still use your older printers with your newer computer. Converts a printer's parallel port for use with a USB port. This cable adapter is only compatible with 36-pin parallel ports: be aware that there are multiple types of parallel ports, some with 25 pins, some with 36. Please check your documentation or count the pins before you order! Length is 36 inches.