Electro-Harmonix Expression Pedal with no moving parts Expression / CV PedalExceptional control, plus instantaneous bypass switching that is completely silentIncrease or decrease the expression sweep range with the Range dialReverse the direction of the pedal's output with the Reverse controlComes with a 6' long 1/4" TRS cableUltra rugged. No footswitches, gears or rack to break It does not use a potentiometer, optics or magnetism to sweep expression-enabled controls The result is a responsive expression pedal that provides precise control over your expression or control- voltage capable effects and instruments