Features Tone, Volume & Fuzz control that automatically adjusts bias for better clean toness Fat/Normal/Tight switch to adjust the guitar's attack. Boost Switch on BluesFuzz models Mid EQ on BluesFuzz models True Bypass switching Runs on 9V to 18V batteries or supplies–9V sounds heavier, more compressed, while 18V is more open and less distorted. Thumbscrew removable bottom with holes for tie-wrap or screw-in pedalboard attachment methods Current: 11mA with at 9V, 15mA at 18V DC Adapter jack, standard 2.1mm X 5.5mm, center ground(-) BATTERIES/SUPPLY NOT INCLUDED Dimensions: 2.7"W X 4.65"D X 2"H Made in the USA 5 Year Limited Warranty