Feature: 1. Voltage Adjustment: 4‑12V adjustable voltage, and the voltage adjustment accuracy is 0.1V, which meets the speed requirements of tattoo artists to operate different parts. 2. RCA Interface: With shutdown, overcharge and overdischarge protection functions. Standard RCA interface, compatible with all standard RCA rotary tattoo machines, tightly connected and not easy to fall off. 3. Simplified Steps: Get rid of the shackles of the traditional power supply that requires multiple accessories to work, omitting the power cord, clip cord, and foot pedal, making the tattoo artist work more convenient. 4. Long Endurance: Built in 2400mAh large capacity battery, it can work continuously for 3‑6 hours when fully charged. The display screen shows the current voltage, battery remaining capacity and operation time. 5. Portable Design: Wireless tattoo power supply adopts aluminum alloy and acrylic material, firm and sturdy, durable. Compact and light, easy to carry, suitable for tattoo salon. Specification: Item Type: Wireless Tattoo Power Supply Material: Aluminum Alloy, Acrylic, Electronic Components Interface: RCA Interface Battery: Built In Lithium Battery 2400mAh Power Supply Size: Approx. 67 x 32.5 x 32.5mm / 2.6 x 1.3 x 1.3in Input: DC5V 1A Output: 4-12V Output Voltage Adjustment Accuracy: 0.1V, long press to quickly adjust Display Screen: Display current voltage, battery remaining capacity, working hours Charging Time: 3 hours (it is strictly forbidden to use a charger higher than 5V to charge) Use Time: 3-6 hours. Package List: 1 x Wireless Tattoo Power Supply1 x USB Charging Cable1 x Power Supply Storage Box Note: 1. Adjustable voltage, click to adjust "+" "‑" 0.1V2. Display "S" as normal startup mode3. Quickly double click the power button to switch the strong start mode4. Display "J" as strong startup mode5. Normal startup mode6. Strong start mode7. Type C fast charging portPlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.