Incredible high end analog preamp that is equally at home with microphones and musical instruments. Great for both audio recording and live performance.It has too many features to describe here- please do your research and you'll appreciate its capabilities and sound quality. They were built with an internal slot that accepts an optional digital output board (not included). In my experience very few people added this. I estimate it has fewer than 5 hours total use since the day I bought it. It is in like new condition and has never left my smoke free home studio. Includes the original hard case (they didn't all come with it), manuals and AC cord.