Thank you for viewing. This unit can be used in various ways, such as between a preamp and power amp for jazz chorus countermeasures, or as a Nutube compressor. It's all up to your ideas. One-owner item. I've taken it out about twice, so there might be some scratches, but please check the photos. I believe everything that came with it at the time of purchase is included, as shown in the photos. Batteries are not included. Thank you.