This is a bass preamp equipped with a variety of effects. The manual is available as a PDF online, so please refer to it for functions and inputs/outputs. I was using it until recently, but I've figured out my preferred sound, so I no longer need it. I think it's perfect for those who want to try out all sorts of amps and cabinets! There are minor scratches from use, but they are not very noticeable. A ferrite core has been attached to the power cable for noise reduction. Please remove it if you don't need it. I liked that it didn't take up much depth for an amp head, so it didn't get in the way on my desk. Please check the photos for the condition.