Features： 1、Voltage 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. 2、Standard RCA Interface: Tattoo power supply is compatible with all standard RCA tattoo machines, tightly closed, not easy to drop, and cordless design. 3、LCD 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. 4、Long 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. 5、Lightweight 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. Specification： Item Type: Cordless Tattoo Power Material: Aluminum Alloy, Acrylic, Electronic Components Interface: RCA Interface Battery: Built In Lithium Battery 1600mAh Power Supply Size: Approx. 51 x 32mm / 2.0 x 1.3in Input: DC5V 1A Output: 4-12V Strong Start: 8V Output Voltage Adjustment Accuracy: 0.1V, Long Press For Fast Adjustment Display Screen: Display The Current Voltage, Remaining Power, Working Hours Charging Time: 2 Hours (Charging With A Charger Higher Than 5V Is Strictly Prohibited) Use Time: Can Be Used For About 6 Hours Package List： 1 x Cordless Tattoo Power Supply 1 x USB Charging Cable 1 x Storage Box