Ambition Ninja Wireless Tattoo Machine with 4mm Stroke

Feature： 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 vol