Looking to add rich, warm overdrive to your rig This used MXR M66S Classic Overdrive pedal delivers smooth, vintage-inspired tones in a compact, rugged housing. In good condition with light cosmetic wear, it features simple controls for Output, Tone, and Gain, allowing for easy shaping of your sound. The M66S includes a classic circuit design with true bypass switching to maintain your signal clarity when disengaged. Powered by a 9V battery or optional AC adapter (not included), it's a reliable choice for blues, classic rock, or adding just the right amount of edge to your tone.