Feature:1. ADJUSTABLE VOLTAGE: It allows for voltage adjustment from 3 to 12V, with a accuracy of 0.1V. This meets the varying speed requirements of artists while operating on different parts of the body.2. LARGE LED DISPLAY: It features a large LED digital display, providing more accurate voltage output readings. This ensures precise control and allows artists to have a better understanding of their settings during tattooing.3. LIGHTWEIGHT AND COMPACT: It is designed to be lightweight and compact, seamlessly integrating with your tattooing pen. Its ergonomic design provides ease of operating, allowing for a comfortable tattooing experience.4. INTERFACE: It is compatible with most tattooing machines. The secure and tight connection ensures stability and prevents accidental disconnection.5. STREAMLINED OPERATING: It eliminates the need for multiple accessories such as power cords, clip cords, and foot pedals that are required with traditional power supplies, making it more convenient for artists to work.6. LONG BATTERY LIFE: With a built in 1500mAh high capacity battery, the power supply can work continuously for approximately 7 hours when fully charged and operating at 5V.Specification:Item Type: Wireless Tattooing Power SupplySize: Approx. 70 x 30mm / 2.8 x 1.2inBattery: Built in Li Battery 1500mahOutput Voltage: 3-12V AdjustableVoltage: Short Press 0.1V, Long Press for Quick AdjustmentCharging Interface: USB Type CCharging Voltage: DC5V /1ACharging Time: 2-3 HoursEndurance Time: Under Full Charge, 5V Working Voltage Can Last For 7 Hours.Package List:1 x Wireless Tattooing Power Supply1 x USB Charging Cable