The Small Black Power Supply is a great backup supply for any artist. The shell is black and made of steel. It has a stable output of 15 volts at 1.5 amps and contains two phono jacks. The Small Black Power Supply measures 4 3/4” long, 3 7/8” wide, and 2 1/4” tall. This power supply can work at both 110V and 220V.