Feature: 1. 4‑12V Adjustable Voltage: Easily adjust the voltage with a precision of 0.1V to meet the speed requirements of tattoo artists working on different body parts. 2. Standard RCA Interface: Tattoo power supply is compatible with all standard rca rotary tattoo machines, ensuring a tight connection for uninterrupted performance. 3. Long Battery Life: Equipped with a built in 2400mAh high capacity battery, it can work continuously for 3‑6 hours when fully charged. Perfect for large area tattoos, and you can alternate between 2 power supplies. 4. LCD Display: Power supply features a clear LCD screen that shows the current voltage, remaining battery level, and operating time, providing convenience for tattoo artists to monitor and adjust settings. 5. Protection Function: RCA power supply has built in shutdown, overcharging, and over discharging protection functions to ensure safe and reliable operation. 6. Portable: Wireless tattoo power supply eliminates the need for power cords, foot pedals, and hook lines, making tattooing more convenient. Its small size and lightweight make it convenient for tattoo artists to carry. Specification: Item Type: Tattoo Power Supply Material: Aluminum alloy, electronic components Interface: RCA interface Battery: Built in lithium battery 2400mAh Power Supply Size: Approx. 67 x 32.5mm / 2.6 x 1.3in Input: DC5V 1A Output: 4-12V Output Voltage Adjustment Accuracy: 0.1V, long press can be quickly adjusted Display: Shows the current voltage, remaining power, working hours Charging Time: 3 hours (strictly prohibited to use chargers higher than 5V charging) Use Time: Can be used for 3-6 hours. Package List: 1 x Tattoo Power Supply1 x USB Charging Cable1 x Power Supply Storage Box