Available Colors - Silver & Grey Output Voltage - 0-18 Volts Amps - 3.4 Amps Magnetic - This power supply has a magnetic backing and will stick to any metal flat surface or flat workstation. 2 Machines - You can connect 2 machine. Hold down the knob for 2 seconds to switch between machine 1 & 2. The power supply will also memorized the last voltage used. 2 Pedal Modes - For those who do not like to hold down the foot pedal can use continuous mode. Just push down quickly on the knob to activate (green light will light up) Then to turn off push quickly again to turn off green light.