This is a "3 BAND PARAMETRIC PRE-AMP" by CARL MARTIN, made in Denmark. It's mainly used for electric guitar and electric bass. I am the original owner, having purchased it new myself. This is one of the effects pedals I've decided to sell off since I no longer use them. If you are concerned about it being used, please refrain from purchasing. No claims and no returns accepted. It functions normally. I used it for a few months when I first bought it, but there are no noticeable scratches. The green ▲ tape is still attached to the knobs. Velcro for attaching it to a board is still attached to the back. The following items will be sent: ・"CARL MARTIN 3 BAND PARAMETRIC PRE-AMP" main unit ※Please refrain from price negotiations. ※Due to work, it may take 2-3 days to ship.