Feature: 1. 4‑12V ADJUSTABLE VOLTAGE: Easily adjust the voltage to meet the speed requirements for different tattooing areas with a precise of 0.1V. 2. STANDARD RCA INTERFACE: Tattoo power supply compatible with all standard RCA rotary tattoo machines, providing a secure and stable connection. 3. WIRELESS DESIGN: Wireless tattoo power supply no need for power cords, foot switches, or clip cord, making it more convenient for tattoo artists. 4. LONG BATTERY LIFE: Equipped with a built in 1600mAh high capacity battery, it can be fully charged in 1‑1.5 hours and provide approximately 4‑5 hours of continuous work. 5. LCD DISPLAY: The display screen shows the current voltage, remaining battery level, and operation duration. It also features shutdown, overcharge, and over discharge protection functions. Specification: Item Type: Wireless Tattoo Power Supply Material: Aluminum alloy, electronic components Interface: RCA Interface Battery: Built in Lithium Battery 1600mAh Power Supply Size: Approx. 75 x 30mm / 3 x 1.2in Input: DC5V 1A Output: 4-12V Output Voltage Adjustment Precision: 0.1V, Long press for quick adjustment Display Screen: Displays current voltage, remaining battery level, and working duration Charging Time: 1-1.5 hours (Using chargers with voltage not exceeding 5V is strictly prohibited) Usage Time: Approximately 4-5 hours of continuous use. . Package List: 1 x Wireless Tattoo Power Supply1 x USB Charging Cable