Feature: 1. 4.2‑12V Adjustable Voltage: The voltage adjustment accuracy is 0.1V, which can meet the speed requirements of tattoo artists operating different parts. 2. Dual Mode Control Switch: It can be controlled by the switch button on the power supply, and can also be controlled by the switch control cable. Just connect the control cable to the Type C port of the power supply to control. 3. Large LCD Digital Display Screen: Makes the voltage output display more accurate, which is convenient for observation and operation. Lightweight and compact. 4. Standard DC Interface: Suitable for most tattoo machines with DC interface, not easy to fall off, safer to use. Omit power cord, clip cord, and foot pedal, making it more convenient for tattoo artists to work. 5. Long Endurance: Built in 1400mAh high capacity lithium battery, fully charged and under the state of 5V working voltage, can continue to work for 4‑8 hours. Specification: Item Type: Wireless Tattoo Power Supply Material: Aluminum Alloy Interface: DC Interface Battery: Built In Lithium Battery 1400mAh Power Supply Size: Approx. 84 x 32 x 32mm / 3.3 x 1.3 x 1.3in Switch Control Cable Length: Approx. 27.5cm / 10.8in Charging Cable Length: Approx. 95cm / 37.4in Power Input Voltage: 5V Output Voltage: 4.2-12V Voltage Regulation Accuracy: 0.1V Charging Time: 4 hours (charging with a charger higher than 5V is strictly prohibited) Charging Port: USB Type C Working Time: 4-8 hours for normal use. Package List: 1 x Tattoo Power Supply1 x Charging Cable1 x Switch Control Cable Note: Please allow slight error due to manual measurement. Thanks for your understanding.