Note: Please allow slight error due to manual measurement. Thanks for your understanding. specification: Item Type: Wireless Tattoo Power Supply_x000D_Material: Aluminum Alloy_x000D_Interface: DC Interface_x000D_Battery: Built In Lithium Battery 1400mAh_x000D_Power Supply Size: Approx. 84 x 32 x 32mm / 3.3 x 1.3 x 1.3in_x000D_Switch Control Cable Length: Approx. 27.5cm / 10.8in_x000D_Charging Cable Length: Approx. 95cm / 37.4in_x000D_Power Input Voltage: 5V_x000D_Output Voltage: 4.2-12V_x000D_Voltage Regulation Accuracy: 0.1V_x000D_Charging Time: 4 hours (charging with a charger higher than 5V is strictly prohibited)_x000D_Charging Port: USB Type C_x000D_Working Time: 4-8 hours for normal use Features: 14.2?12V Adjustable Voltage: The voltage adjustment accuracy is 0.1V, which can meet the speed requirements of tattoo artists operating different parts. 2Dual 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. 3Large LCD Digital Display Screen: Makes the voltage output display more accurate, which is convenient for observation and operation. Lightweight and compact. 4Standard 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. 5Long 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. PackageList: 1 x Tattoo Power Supply 1 x Charging Cable 1 x Switch Control Cable