The classic returns, first conceived by David Oreste Defrancesco (DODs namesake) in the70s as a way to get distortion and boost without any of the downsides that came with some of the fuzzes of the era. This updated version uses the vintage correct LM741 OpAmp, just like back in the70s. Modern appointments like a tough, light, pedalboard friendly aluminum chassis. standard power input jack, true bypass, LED indicator, and bullion gold powder-coat makes the 250 at home on any pedalboard. General Specifications INPUT 1¼Instrument OUTPUT 1¼Instrument CHASSIS MATERIAL All Metal POWER SUPPLY 9V Alkaline Dry Battery, PS0913DC power supply Dimensions HEIGHT 2.25WIDTH 2.63LENGTH 4.68WEIGHT 0.62 lbs.