Since I thought it was broken, I'm selling it as junk. However, when I turned it on, it did produce sound. I think all the controls are working, but there's a lot of crackling, and the contacts seem unreliable. It might be usable if repaired, but please be aware of its condition. As an effects pedal, it offers a wide range of tone adjustments and is very interesting. It's quite old, probably from the 80s. (It's the model following the 1980s Maxon Zero One series "OD-01 THE DRIVER", the "OVERDRIVE PLUS") The PHASE and MIX controls are unique, allowing you to control the sound clarity with phase adjustment, and it seems to add an exciter-like effect. It can create sounds from warm overdrive to high-gain distortion. There's a footswitch input, but I haven't checked it. I checked it with an adapter. I haven't checked the battery. - Model: OD-02 OVERDRIVE PLUS - Made in: Japan - Control Knobs: Phase, Mix, Tone, Level, Drive - Connections: Input, Output, Footswitch - Pedal Type: Overdrive Effect Pedal Thank you for looking.