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 3 ft.