Feature: 1. ADJUSTABLE VOLTAGE: Tattoo power supply allows for adjustable voltage ranging from 4‑12V, with an accuracy of 0.1V, satisfying the speed requirements of tattoo artists for different body parts. 2. STANDARD RCA INTERFACE: Tattoo power supply is compatible with all standard RCA rotary tattoo machines, ensuring a tight and secure connection without any loose connections. 3. WIRELESS DESIGN: Wireless power supply eliminates the need for power cords, foot switches, and clip cords, making it more convenient for tattoo artists to work. 4. LONG BATTERY LIFE: With its built in 2000mAh large capacity battery, it can be fully charged in 3 hours and provide continuous operation for approximately 5‑7 hours. 5. OLED DISPLAY SCREEN: The power supply features an OLED display screen that shows the current voltage, current, working duration, and remaining battery life. Specification: Item Type: Wireless Tattoo Power Supply Interface: RCA Interface Material: Aluminum alloy, electronic components Battery: Internal Lithium Battery 2000mAh Power Supply Size: Approx. 28 x 80mm / 1.1 x 3.1in Display: OLED Input: DC5V 2A (Input voltage must not exceed 5V-2A) Output: 4-12V Output Voltage Adjustment Accuracy: 0.1V, long press for quick adjustment Display Screen: Displays current voltage, current, operating time, and remaining battery life Charging Time: 3 hours (charging with voltage higher than 5V is strictly prohibited) Usage Time: 5-7 hours of continuous use Product Characteristics 1. Pre set 5 voltage levels 2. Screen display orientation can be adjusted left or right 3. Work timer function 4. Overcurrent protection can be toggled on or off as needed 5. Quick start default setting is on, can be toggled on or off as needed 6. Manual power off or auto power off when idle, default wait time before auto power off is 5 minutes, can be set to 15 or 30 minutes as needed Protection Function: 1. Output short circuit and overcurrent protection 2. Input overcharge and over discharge double protection (Battery self protection and control board protection) How to Use: Voltage Adjustment: Press or long press the "+" button to increase the voltage in 0.1V increments. Press or long press the "-" button to decrease the voltage in 0.1V increments. Double click the "P" button to use pre set voltages. Menu: The menu allows for operation and settings including: Timer reset, overcurrent detection switch, shutdown mode, screen orientation, quick start switch, and pre set voltages. In idle state, long press the "P" button to enter the menu. Then, use the "+" or "-" buttons to browse the menu, press the "P" button to set the option value, and long press the "P" button to exit the menu and return to idle state. Menu 1: Timer reset. In idle state, long press the "P" button to enter the menu, select "WORK TIME" interface, press the "P" button to reset the timer and exit the menu to return to idle state. Menu 2: Overcurrent detection switch. In idle state, long press the "P" button to enter. Package List: 1 x Wireless Tattoo Power1 x Charging Cable1 x Instruction Manual