Thank you for viewing. This is a Dr. Z Air Brake attenuator. It's a tool that allows you to drive tube amps like Marshall, Fender, and Bogner at home-friendly volumes. (Bedroom mode allows you to get great sound even at very low volumes.) Also, it's an essential item for amateur guitarists to recreate the powerful sound of live performances by Clapton, Jimmy Page, and other legendary rock guitarists in studios or live settings. If you have a good amp but are struggling with your sound, try an attenuator instead of effects pedals. This item has almost no sound quality loss among attenuators, and I was quite fond of it, but I'm selling it because I don't have many opportunities to play guitar anymore. No claims, no returns, please.