The Messner is a low gain-transparent overdrive boasting a wide range of overdrive possibilities. It is designed to preserve the natural voice of your guitar by not coloring your tone, but giving the user the ability to dial in and out the exact amount of tone they desire. A toggle switch allows the user to bypass the clipping diodes from the circuit in the open position and employ them in the closed position, allowing a wide range of breakup from subtle to dramatic. Flip it to the open position and dial in a lower drive setting to add subtle aggression to your tone. Run it in the closed position and turn the gain knob up for more compressed and punchy tones. It has 6,3 mm input and output. Power supply: 9 V DC not included. Dimensions: 121 x 74 x 58 mm.