Converts 12 volts DC from a battery or power supply, to a variable 12 to 24 V voltage. Output power is 60 watts. That means 5 amps output current at 12 volts, or 3.3 A at 18 volts, or 2.5 amps at 24 volts. You can turn the knob to dial any voltage between 12 and 24 volts.