Original Seymour Duncan Shape Shifter Tremolo and Vibrato pedal with tap tempo. The ratio mode and wave form knob provide everything from wavy vibrato to choppy tremolo. It is a very versatile pedal for all things vibrato and tremolo, plus trippy space sounds to boot. Best bass tremolo I have tried. In great used shape with original box and manual. The pedal has velcro on the bottom and is ready for your board. $79 shipped in the lower 48.