The Tripp Lite USA-19HS KeySpan USB to Serial Adapter allows for high-speed communication between devices with RS-232 ports and computers with USB connectivity. This portable adapter features a 1:9 connection split/duplication, making it suitable for universal use with Windows and Mac operating systems. With a cable length of 3 feet, this black adapter from Tripp Lite is a reliable and efficient solution for connecting your computer to various serial devices.