Ambition NINJA Wireless Tattoo Machine Pen

Material : space aluminum alloy Needle Stroke : 4.0mm Motor : Coreless Motor. Ambition Coreless motor is good with lining, shading, color packing, lettering, traditional, neotraditional. Motor Speed : 10V - 9000RPM Battery Capacity : - Long battery: 2400mAh - Short battery: 1650mAh Charging time : 2 hours Operation time : Long battery: about 7 hours; Short battery: about 3 hours Output fixed current ：2A Working voltage : 3.7V Output Voltage : 5V-12V LCD display content : output voltage range + battery usage 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. When you long press the voltage adjustment buttons, the voltage will change by 0.5V each time. Power: The LED display will show the remaining power, and the full power will display 4 divisions. Fast charging through the matching fast-charging USB data cable can usually be fully charged about 2 hours.