Feature: 1. Adjustable Voltage: 4‑12V voltage adjustment with 0.1V precision, meeting the speed requirements for tattooing different areas. 2. Large LED Display: The digital display screen provides accurate voltage output reading for precise tattooing. With a built in 1300mAh battery, it can work continuously for approximately 4‑8 hours on a full charge. 3. Lightweight And Compact: The power supply seamlessly integrates with your tattoo pen, ensuring easy and comfortable handling. 4. Standard RCA Interface: Suitable for most tattoo machines with RCA interface, ensuring a secure and stable connection. 5. Convenient Operation: Say goodbye to the need for multiple accessories like power cords, foot pedals, and clip cords, making tattooing more convenient. Specification: Item Type: Tattoo Power Supply Material: Aluminium alloy, electronic components Size: Approx. 32 x 63mm / 1.3 x 2.5in Battery: Lithium battery 1300mAh (built in) Output Voltage: 4-12V adjustable Voltage Adjustment Accuracy: Short press 0.1V, long press fast adjustment Power Connector: RCA connector Charging Interface: USB Type C Charging Voltage: DC5V /1A Charging Time: About 3 hours Battery Life: 4-8 hours Strong Start Function: After power on, press and hold the "+, -" key at the same time for 3 seconds, you can turn on/off the strong start function. LED Screen Display: Current voltage, remaining battery power . Package List: 1 x Wireless Tattoo Power Supply 1 x USB Charging Cable 1 x Finger Switch 1 x User Manual