Professional Power Supply The Main difference is the 10 turn Potentiometer. 1 volt for 1 turn so you can tune your machine very very smoothly. one block aluminium casing. Powder coated surface. Blue LCD display. Voltage In: 110-220V voltage Out: 1.5-16volt Current: 2Amps Potentiometer: 10 Turns Casing: One block Aluminium Body