Portable 20 gallon, 2 HP air compressor. Cast-iron, twin cylinder, oil lubricated pump for extended life. Over 35% quieter than oil-less compressors for quieter work environment. Dual voltage motor allows unit to be run at the normal household 120V or 240V for business or contractors. Pre-wired at 120V - changing voltages requires moving a couple wires on back of motor (instructions included). Large 10" semi-pneumatic wheels allow easy portability. Ideal for garage and workshop applications. Less slippage from the premium notched belt increases performance of the pump and motor. Premium notched belts are high quality belts that last up to 5 times longer without re-tensioning. Industrial metal wire belt guard with open design allows belts to run cooler and last longer. Rugged metal material increases durability. SCFM (Standard Cubic Feet per Minute) 6.5/5.5 at 40/90; maximum psi (pounds per square inch): 135.