Specification: Condition: 100% Brand New Item Type: Tattoo Power Supply Material: Aviation Aluminum Alloy Optional Type:DC Built-In Battery: battery, 2000mAh Output Voltage: 5-12V Charging Cable Interface: Type-C---USB Instructions for use: 1. Long press the power button for 2 seconds to turn on and off the machine, and the remaining power and real-time voltage are displayed at this time 2. Short press the up key or down key to add or subtract 0.5V voltage 3. Short press the power button to pause 4. Long press the power button for 2 seconds to shut down Endurance Time: It can be used for about 8 hours under full power of 8V. Package List: 1 x Tattoo Power Supply1 x Charging Cable Note: 1. It is recommended to totally charge before use.2. It can be used for about 8 hours under a full power of 8V. Since the voltage is constantly changing when the tattoo artist is working, the battery life may vary. Aperture Size: Length: Approx.8mm/0.31in Outer Wall Diameter: Approx.5.2mm/0.20in Aperture: Approx.2.1mm/0.08in (DC plug with hole pin 2.00mm)