Feature: 1. Adjustable Voltage: The voltage adjustment range of this power supply is between 3 and 12V, and the accuracy of the adjustment voltage is 0.1V, which can meet the needs of tattoo artists operating different parts. 2. Wireless: Get rid of the traditional power supply to use multiple accessories in order to work, omitting the power cord, hook cord, foot pedal, so that the tattooist work more convenient, to avoid the interference of the winding wire. 3. Large Capacity Battery: Built in 1500mAh lithium battery. In a fully charged state, can work continuously for 4 to 8 hours. If you needa large area tattoo , you can use alternately with two power supplies 4. LED Display: This tattoo power supply is equipped with a smart display that shows the current voltage, making easy for the tattoo artist to observe and operate and adjust the voltage at any time. 5. Lightweight: This power supply is lightweight and compact. The power supply and tattoo pen together are not too heavy and will not affect the tattoo results, allowing you to operate freely. Specification: Item Type: Wireless Power Supply Material: Aluminum Alloy, Electronic Components Interface: RCA connector Battery: Built in lithium battery 1500mAh Power Supply Size: Length: (Approx.) 7.5cm / 3in Maximum Diameter: (Approx.) 3.1cm / 1.2in Input: DC5V 1A Output: 3-12V Output Voltage Adjustment Accuracy: 0.1V, long press for quick adjustment Charging Interface: Type-C Charging Time: 2 hours (Do not use a charger higher than 5V for charging) Use time: 4 to 8 hours. Package List: 1 x Wireless Power Supply1 x USB Charging Cable