The OD-20 Drive Zone uses advanced COSM technology to model the sound of classic overdrive/distortion pedals of the past 30 years, as well as creating new sounds of its own. There are 22 models to choose from, plus Attack Shape and Heavy Octave parameters for dialing in subtle nuances or extreme tones. You can even switch amp channels remotely using the OD-20"s Amp Control jack. There"s also six new overdrive and distortion sounds ranging from mellow crunch to bottom-heavy distortion and screaming metal. Using Attack Shape, guitarists can adjust the overdrive model"s response to match their playing. There"s also a new Heavy Octave control which produces low octave sounds for any notes played below the fourth fret of the fourth string-great for simulating thick 7-string type sounds heard in modern rock music. Nominal Input and Output Level - -20 dBu Input Impedance - 1 M ohms Output Impedance - 1 k ohms Load Impedance - 10 k ohms or greater Dynamic Range - 102 dB (IHF-A typ.) Indicators - Power Indicator, EFFECT ON/OFF Indicator, and MANUAL Indicator (1 to 4) Connectors - INPUT, AMP CTRL, LINE OUT/PHONES, OUTPUT, and AC Adaptor (DC 9V) Power Supply - DC 9V Dry battery (AA type) x 6 or AC Adaptor Included Accessory - Dry battery (AA type) x 6 (We recommend that alkaline batteries be used when replacing the batteries.) Dimensions - Width 6-13/16 x Depth 6-1/4 x Height 2-1/4 (173x158x57mm) Weight - 2 pounds 7 ounces (1.1 kg)