This is a Canon USB to parallel converter cable. It's used to connect a PC with a USB port to an older printer with a Centronics 36-pin (IEEE 1284) port. Power is supplied from the PC's USB port. It supports specific older operating systems like Windows 98 and allows for bidirectional communication. The cable length is approximately 2 meters. I purchased this used over 15 years ago and used it as my main cable at the time. It became unnecessary when I replaced my printer and has been stored since then. Currently, its operation has not been confirmed. It's probably not needed for home printers, but it might still be useful as a spare for business use. There is some yellowing due to aging. Please purchase only if you understand the above. Immediate purchase is welcome. Thank you for looking.