1The crunch distortion effect pedal as a classical British rock deformation, has a strong response and support. The control knob makes accurate finetuning easy 2Three knobs are separately used to adjust the distortion(gain knob), adjust the volume of sound(volumn knob) , and adjust the strength of the tone(tone knob) 3Come with True Bypass designs, which will minimize tone loss to realize the original sound of your guitar 4LED can visually indicate the working status of the guitar pedal, powered by DC 9V adapter, very convenient 5Aluminum alloy casting with fine finished surface and stylish appearance. Equipped with standard 1/4 inch input and output sockets Item Type: Electric Guitar Effect Pedal Model: JDF-3 Input Impedance: 1m Ohms Output Impedance: 1k Ohms Working Current: 10mA Power Supply: DC9V adapter (not included) Size: Approx. 4cm / 1.6in Approx. 9.1cm / 3.6in Approx. 3.2cm / 1.3in Approx. 1.9cm / 0.7in Approx. 1cm / 0.4in 1 xElectricGuitarEffect Pedal 1 x User Manual Pleaseallow1& 8209;2mmerrorduetomanualmeasurement.Thanksforyourunderstanding.