Please note: 1. It is recommended to fully charge before use. 2. It can be used for about 8 hours with full power at 8V. Since the voltage constantly changes when the tattoo artist is working, the battery life may vary. 3. Please note that the new and old types of this product will be shipped randomly, and make sure you don't mind before ordering. Specification: Condition: 100% Brand New Item Type: Tattoo Power Supply Material: Aviation Aluminum Alloy Brand: GHOST AXE Optional Type: RCA, DC Opening Size: Length: Approx. 8mm/0.31in Outer Wall Diameter: Approx. 5.2mm/0.20in Opening: Approx. 2.1mm/0.08in (DC connector with hole pin 2.00mm) Built-in Battery: Lithium-ion battery, 2000mAh Output Voltage: 5-12V Charging Cable Interface: Type-C Interface Instructions for use: 1. Long press the power button for 2 seconds to turn the machine on and off, and the remaining power and real-time voltage are displayed at this time 2. Short press the up or down button 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 turn off Durability: It can be used for about 8 hours with full power at 8V. Features: 1、Wireless power supplies provide efficient performance. Lightweight, unique design. 2、Adjustable voltage, 5?12V voltage is adjustable, each press of the up or down button can increase or decrease 0.5V, easy operation. 3、LCD screen, real-time display of remaining power and voltage. 4、Protection mechanism, both battery and control board have power-off, overcharge and over-discharge protection functions. 5、2 types of interfaces are optional, suitable for tattoo machines with standard RCA interface or DC interface with a diameter of 5.2mm Package List: 1 x Tattoo Power Supply 1 x Charging Cable