Feature: 1. Adjustable Voltage: The tattoo power supply offers an adjustable voltage range from 3V to 12V with a precision of 0.1V, suitable for various tattooing techniques and speed requirements. 2. LED Display: Equipped with a large LED digital screen for clear and accurate voltage output display, providing convenience and precision during use. 3. Lightweight and Compact Design: The unit is lightweight and compact, allowing for easy integration with your tattoo pen and comfortable handling during operation. 4. RCA Interface: Features a standard RCA output interface that is compatible with most tattoo machines using RCA connections. The secure fit helps prevent accidental disconnections. 5. Built-in Rechargeable Battery: Integrated 1500mAh lithium battery provides approximately 7 hours of continuous use at 5V when fully charged. Supports USB Type-C charging for reliable performance. Specification: Item Type: Tattoo Power Supply Material: Aluminum alloy, silicone, electronic components Product Size: Approx. 33 x 52mm / 1.3 x 2in Battery: Built-in 1500mAh lithium battery Output Voltage: 3–12V adjustable, 0.1V adjustment accuracy Power Interface: RCA interface Charging Port: USB Type-C Charging Voltage: DC 5V / 1A Charging Time: 2–3 hours Battery Life: Up to 7 hours of continuous operation at 5V when fully charged Package List: 1 x Tattoo Power Supply 1 x USB Charging Cable