Power characteristics Professional Digital Tattoo Machine Tattoo Power Supply Tattoo Kit Supply Full micro processor unit Output: 0-18V user selectable voltage increments: 0.1, 0.2, 0.5 V Build in 2A overloadcurrent protection Newest design power supply Stop watch, so you can accurately keep track of time taken on a job Allows up to 4 machines pre set memory modes for liners/shaders One button to decide how you like the pedal works: a long time work or just a short time permanent memory, can keep long time memory of its working mode Working voltage: 110V-240V, Frequency: 50/60HZ Display: Volts, Amps, Speed, Duty, Time, Stop watch, Pre set status Includes color match table/wall mount, power plug. Package A included: 1 pc tattoo rotary pen machine(with DC cord). 1 set Professional Power Supply System. 1 pcs High Quality Stainless Steel Pedal. Package B included: 1 pc tattoo rotary pen machine(with DC cord).