Mast Skate Power supply have more function supply a different tattoo feeling.1-0 Dual mode working, can work with or without pedal, Non-slip mode, Start-up function.On 1-1 mode, both interfaces for machiens output, press button to change output left or right one.Long press 2-3 seconds to power ON, 0.1V voltage adjust. Specifications: Weight: 230g Size: 90*90*30mm Input Voltage: 90-240V out put voltage: 3-12V our put power 0.3-36W