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 alloy 6Needle Strokes: 2.2mm, 2.6mm, 3.0mm, 3.4mm, 3.8mm, 4.2mm. Motor: Coreless Motor. Motor Speed: 10V - 9000RPM Single Battery Capacity: 1800mAh Charging time: about2 hours Operation time: about 6 hours Output Voltage : 5V-12V LCD display content: output voltage range + battery usage+working time Instructions 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： Single Battery: Ambition rotary battery tattoo pen machine includes 1pc Battery Tattoo Pen, 1pc RCA adapter, 1pc charging cable, 1pc Box. Dual Battery：Ambition rotary battery tattoo pen machine includes 1pc Battery Tattoo Pen, 1pc extra battery, 1pc RCA adapter, 1pc charging cable, 1pc Box.