Feature: 1. ADJUSTABLE VOLTAGE: It offers an adjustable voltage range of 3‑12V, with a precise 0.1V. This allows tattoo artists to easily adjust to the required speed for different tattooing areas. 2. LED DIGITAL DISPLAY: Its design gives you an accurate voltage output display, allowing for precise adjustments and greater control during your tattooing sessions. 3. WIRELESS DESIGN: Departing from traditional power supplies that require multiple accessories to function, this power supply eliminates the need for power lines, hook lines, and foot pedals, simplifying the setup and making your tattooing process more convenient. 4. LARGE CAPACITY BATTERY: with a built in 1500mAh large capacity battery. At full charge and with a 5V operating voltage, it can work for about 7 hours continuously. For large scale tattooing, the 2 power supplies can be used alternately, ensuring uninterrupted operation. 5. STANDARD RCA INTERFACE: Its design is compatible with most RCA interface tattoo machines. The firm connection ensures it will not fall out easily, adding to your convenience and efficiency. 6. LIGHTWEIGHT AND COMPACT: It is compact, integrating seamlessly with your tattoo pen for smoothness and uninterrupted operation. Specification: Item Type: Tattoo Power Supply Material: Aluminum Alloy, Electronic Components Size: Approx. 70 x 30mm / 2.8 x 1.2in Battery: Built in Li ion Battery 1500mAh (included) Output Voltage: Adjustable 3-12V Voltage: Short press 0.1V, long press for fast adjustment Power Interface: RCA Interface Charging Interface: USB Type C Charging Voltage: DC5V / 1A Charging Time: 2-3 hours Battery Life: In a fully charged state, the 5V operating voltage can continue to work for 7 hours. Package List: 1 x Wireless Tattoo Power Supply 1 x USB Charging Cable