Feature: 1. Voltage 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. 2. Simple 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. 3. Long 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. 4. Multiple 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. 5. Aluminum Alloy Material: Tattoo power supply adopts great aluminum alloy material, safe and eco friendly, firm and sturdy, no deformation, stable and durable. Specification: Item Type: Tattoo Power Supply Material: Aluminum Alloy Battery: Built In Lithium Battery 1300mAh Size: Diameter: Approx. 25mm / 1in, Length: Approx. 63mm / 2.5in Charging Time: About 3 hours Working Time: 5-8 hours Charging Interface: TYPE C/5V/1A. Package List: 1 x Cordless Tattoo Power Supply1 x USB Charging Cable1 x Manual Note: Please allow slight error due to manual measurement. Thanks for your understanding.