Note: Please allow slight error due to manual measurement. Thanks for your understanding. specification: Item Type: Tattoo Power Supply_x000D_Material: Aluminum Alloy_x000D_Battery: Built In Lithium Battery 1300mAh_x000D_Size: Diameter: Approx. 25mm / 1in, Length: Approx. 63mm / 2.5in_x000D_Output Voltage: 6V 7V 8V 9V 11V_x000D_Charging Time: About 3 hours_x000D_Working Time: 5-8 hours_x000D_Charging Interface: TYPE C/5V/1A Features: 1Voltage Adjustment: 6V, 7V, 8V, 9V, 11V adjustable voltage to meet the speed requirements of the tattoo artist to operate different parts. Integrates the power supply with your tattoo pen. 2Simple Operation: Get rid of the shackles of traditional power supplies that require multiple accessories to work, and omit power cords, clip cord, and pedals, making it more convenient for tattoo artists to work. 3Long Endurance: Built in 1300mAh high capacity battery, charging time is about 3 hours, when fully charged, it can work for 5?8 hours, bring you convenience. 4Multiple Applicable Place: Light weight and in small size, easy to store and carry, can be easily put into your bag, suitable for home and tattoo salon. 5Aluminum Alloy Material: Tattoo power supply adopts great aluminum alloy material, safe and eco friendly, firm and sturdy, no deformation, stable and durable. PackageList: 1 x Cordless Tattoo Power Supply 1 x USB Charging Cable 1 x Manual