The multi-functional guitar effects unit, the RCL-10, features six control knobs and provides mode output. - Brand: BOSS - Model Name: RCL-10 - Number of Control Knobs: 6 - Output Terminals: Mode Output - Color: Black Thank you for viewing. Knobs have scratchiness. Sound may be unstable or may not output sound at all. For those who want to use it even if it needs repair, please consider. This is a junk item, so no refunds, returns, or complaints will be accepted.