Brushless Motor Wireless adjustable stroke tattoo permanent makeup Machine K6031

shell aluminum.DC 5V charger,Output: 5-12V 800MACompatible with universal cartridge needlesOLED screen display with voltage and working timeUpgraded with powerful 2000MA battery capacity, 4mm hair stroke,lasting working 5-8 hours.How to use:1. Press and hold control button for 3 s to turn on/ off the device.2. Press control button once to start/ stop the machine.3. Press control button twice to check battery charge level.4. When the motor is working, press and hold control button, moving it to the right or to the left at the same time to increase/ decrease machine voltage.5. When the battery charge level is less than 20%, charging symbol will shows up. This means you should change your battery for the charged one immediately.