Attach to your favorite effect pedal with an expression input and switch between two preset expression settings with a stomp of your foot. Boss-standard 9V power supply required (not included) to power Illuminated sliders and scale. Connect using a TRS cable. Matte-black powder-coated aluminum enclosure with solid carved walnut top. 100k resistance. complete specs at https://www.talltimber.tech/products/expression-toggle.