Maxon OD-820 Overdrive Pro in good working condition. Comes with Ninja Pedals Stickers | Fast Shipping! Improving on their own standard-setting OD808, Maxon has added unique voltage-doubling circuitry for greater headroom. It's the smoothest, warmest, most transparent overdrive ever. Reacts precisely to every picking nuance and playing dynamic. Features true bypass switching. Drive, tone, and level knobs for precision tone control. Uses 9-volt battery or included AC adapter. Features Greater headroom Smooth, warm tone True bypass switching Drive, tone, and level knobs Heavy-duty stomp box