The Uno is a complete USB-to-MIDI solution, equipped with a USB connection to your computer, and a 1-in/1-out 16-channel MIDI connection to your MIDI devices. The Uno works for Windows and Macintosh operating systems. Its single MIDI In and Out connectors make it perfect for connecting a keyboard or controller to your computer quickly and easily. Since it is powered by the USB port, the Uno is convenient and great for portable use.