Features1ADJUSTABLE 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. 2STANDARD RCA INTERFACE: Tattoo power supply is compatible with all standard RCA rotary tattoo machines, ensuring a tight and secure connection without any loose connections. 3WIRELESS DESIGN: Wireless power supply eliminates the need for power cords, foot switches, and clip cords, making it more convenient for tattoo artists to work. 4LONG 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. 5OLED DISPLAY SCREEN: The power supply features an OLED display screen that shows the current voltage, current, working duration, and remaining battery life.SpecificationItem Type: Wireless Tattoo Power SupplyInterface: RCA InterfaceMaterial: Aluminum alloy, electronic componentsBattery: Internal Lithium Battery 2000mAhPower Supply Size: Approx. 28 x 80mm / 1.1 x 3.1inDisplay: OLEDInput: DC5V 2A (Input voltage must not exceed 5V-2A)Output: 4-12VOutput Voltage Adjustment Accuracy: 0.1V, long press for quick adjustmentDisplay Screen: Displays current voltage, current, operating time, and remaining battery lifeCharging Time: 3 hours (charging with voltage higher than 5V is strictly prohibited)Usage Time: 5-7 hours of continuous useProduct Characteristics1. Pre set 5 voltage levels2. Screen display orientation can be adjusted left or right3. Work timer function4. Overcurrent protection can be toggled on or off as needed5. Quick start default setting is on, can be toggled on or off as needed6. 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 neededProtection Function:1. Output short circuit and overcurrent protection2. 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 enterPackage List1 x Wireless Tattoo Power 1 x Charging Cable 1 x Instruction Manual