The Vintage Keyspan USA-19 Macintosh USB To Serial Adapter allows for connecting a USB device to a serial port on a Macintosh computer. It features a translucent design with RS-422 mini-DIN8 ports for connection, supporting data rates up to 1 Mbps. Compatible with Mac OS X 10.6, Mac OS 9.2 and later, and Mac OS X 10.2.8 through 10.5.x, this VGA adapter is a useful tool for accessing older hardware or software that require serial connectivity. Power is drawn from the USB connection, making it convenient for use without the need for additional power sources.