Once you go wireless, you will love Ambition tattoo machine equipment. Experience the freedom of going wireless by turning your favorite tattoo machine into a wireless machine. Material: space aluminum alloy6Needle Strokes: 2.2mm, 2.6mm, 3.0mm, 3.4mm, 3.8mm, 4.2mm.Motor: Coreless Motor.Motor Speed: 10V - 9000RPMSingle Battery Capacity: 1800mAhCharging time: about2 hoursOperation time: about 6 hoursOutput Voltage : 5V-12VLCD display content: output voltage range + battery usage+working timeInstructions for use:- Power ON/OFF: Long press "O" key for 3 seconds- Output pause / resume: Short press "O" key to pause the output, and short press it again to resume the output(the resume voltage is the working voltage before the pause).- Adjust output voltage: Press the "+" or"-" key to adjust output voltage. The voltage can be adjusted through button (+) and (-) respectively with the voltage of 0.1V on each press.Tattoo Power Supply: The LED display will show the remaining power, and the full power will display 4 divisions. Fast charging through the matching charging cable can usually be fully charged about 2 hours. Package Included: Dual Battery:Ambition rotary battery tattoo pen machine includes 1pc Battery Tattoo Pen, 1pc extra battery, 1pc RCA adapter, 1pc charging cable, 1pc Box.