BOSS effector that effectively suppresses noise. - Model Name: Noise Suppressor NS-2 - Brand: BOSS - Function: Noise Suppressor - Input/Output Terminals: INPUT, OUTPUT, SEND, RETURN - Power: 3V dry cell battery or AC adapter Thank you for viewing. I purchased this used 3 months ago but haven't used it, so I'm listing it. There are some scratches and dirt from when I bought it used, and some tape residue from being attached to a board on the back. Operation was confirmed when I purchased it used 3 months ago. AC adapter not included. The unit will be shipped as is.