Wah pedal with 2 Foot-Selectable Wah Modes, Hybrid of Optical Switching and Pot Based Wah, Audio 100K Slide Potentiometer for Traditional Wah Tone, Travel & Q and Quick Clip Battery Door. Powers from one 9V battery. Effect is set in a cold rolled steel housing. The M2 Maverick is a Wah pedal with the additional choice of contour mode. Click the footswitch to the left of the foot pedal to engage Contour mode (the left side LED turns ON). The contour mode allows you to alter the Wah tone and level.FeaturesContour control: Adjusts the tone (shelving) of the Wah when in Contour mode.Level control: Adjusts the Wah output level in Contour mode.Electro-Optical Switching: Your pedal features Electro-Optical switching circuitry that allows the BadSilent Switching: To further enhance the noiseless operation of our Electro-Optical design, Morley has added FET silent switching. Standard foot switches will pop and click when switching from Wah to Bypass.Buffer Circuit: Morley's "Clear Tone" buffer circuit prevents "loading" of the guitar signal.