<p>Instructions for use:</p> <p>The device is a tattoo pen with a built-in lithium battery, which can be used directly without a foot pedal and hook line. It is composed of two parts: 1. The upper half of the lithium battery power supply 2. The lower half of the tattoo pen; the middle part can be unscrewed to replace the upper half of the lithium battery , The specific functions are as follows:</p> <p>1. Power on: Long press the middle "O" key for 5 seconds to turn on, and then long press for 5 seconds to turn off;</p> <p>2. Pause: short press the "O" key during normal work to pause the work, and short press again to resume the working state;</p> <p>3. Adjust the voltage: adjust the voltage range by pressing the "+" or "-" key, and adjust 0.5V every time you press it, the minimum voltage: 5V, the maximum voltage is 12V;</p> <p>4. Battery display: It is displayed on the LCD screen, it is 4 cells when it is fully charged, and the battery needs to be charged when the last cell is left;</p> <p>5. Daily charging: external charging port, use Android USB data cable to charge;</p>