The Mesa Throttle Box is a high gain / distortion pedal from the people that invented the concept! The THROTTLE BOX Distortion serves up all genres of ROCK with cut and aggression, but retains the signature warmth and organic sonic quality found in all of Mesa's instruments. While its main strengths lie in higher-gain sounds, it's also versatile and the lower gain options shouldn't be overlooked for classic rock or howling blues. It also features a unique Mid Cut that scoops out midrange to produce the signature Boogie "V" EQ-curve that so many artists have employed in their amps to create the world's heaviest guitar tones! Custom Designed AND Hand-Built in Petaluma, California, USA True Bypass On/Off Switching - Bypasses all circuitry when off to ensure no tonal loss Gain Control allows you to dial in the perfect amount of classic to modern high-gainLo/High Gain Switch provides classic crunch to modern meltdownMaster Level Control provides a variable range of signal boost up to +20dbTone Control balances the amount of high frequenciesMid-Cut Control provides powerful mid-scoop for modern high-gain stylesInternal EQ-Boost Switch provides added style/voicing optionOn/Off Status LED9V Battery Powered or optional AC Powered via External Power Jack Input Specifications: True Bypass Switching Battery Type: 9VDC (one)AC Adapter (Optional): Power Jack 2.1mm x 5.5mm, 9VDC with Negative Center (Regulated Recommended)