Features1Voltage Range: Tattoo power supply has 4?12V adjusting voltage, adjusting voltage accuracy of 0.1V, to meet the needs of the tattoo artist to operate different parts of the speed. 2Standard RCA Interface: Tattoo power supply is compatible with all standard RCA tattoo machines, tightly closed, not easy to drop, and cordless design. 3LCD Display: Tattoo pen power supply shows the current voltage, remaining power and operating hours in LCD display, easy for tattoo artists to observe and operate. With shutdown, overcharge, overdischarge protection function. 4Long Endurance: Tattoo pen power supply built in 1600mAh high capacity battery, charging 2 hours, fully charged state, you can work continuously for about 6 hours. 5Lightweight and Compact: Let the tattoo pen power supply and your tattoo pen (not included) into one, operate freely. Small size, light weight, easy to carry for the tattoo artist.SpecificationItem Type: Cordless Tattoo PowerMaterial: Aluminum Alloy, Acrylic, Electronic ComponentsInterface: RCA InterfaceBattery: Built In Lithium Battery 1600mAhPower Supply Size: Approx. 51 x 32mm / 2.0 x 1.3inInput: DC5V 1AOutput: 4-12VStrong Start: 8VOutput Voltage Adjustment Accuracy: 0.1V, Long Press For Fast AdjustmentDisplay Screen: Display The Current Voltage, Remaining Power, Working HoursCharging Time: 2 Hours (Charging With A Charger Higher Than 5V Is Strictly Prohibited)Use Time: Can Be Used For About 6 HoursPackage List1 x Cordless Tattoo Power Supply 1 x USB Charging Cable 1 x Storage Box