Feature: 1. Voltage Adjust: Tattoo power supply with 4 to 12V can be adjusted, the adjust accuracy is 0.1V, meet the speed needs of different tattoo parts. 2. 1300mAh Capacity: Tattoo pen power supply built in 1300mAh battery, fully charged can work for 4 to 6 hours, suitable for large area tattoo. 3. LED Screen: Tattoo power supply with LED large screen, so that the voltage output display more accurate, which is convenient to use and operate. 4. DC Interface: Wireless tattoo battery adopted DC port, suitable for most standard DC tattoo machines, provide firm connection without fall off. 5. Convenient Use: Get rid of the traditional power supply to use multiple accessories, omitting the power cord, clip cord, foot pedal for convenient use. Specification: Item Type: Wireless Tattoo Power Supply Material: Aluminum alloy, electronic components Size: Approx. 31 x 67mm / 1.2 x 2.6in Battery: 1300mAh Lithium Battery(Included) Output Voltage: 4-12V (adjustment accuracy is 0.1V) Interface: DC Interface Charging Interface: USB Type C Charging Voltage: DC 5V /1A Charging Time: 2 hours Battery Life: 4-6 hours Strong Start Function: After boot, hold down the "+, - "key for 3 seconds at the same time, you can turn on/off the strong start function. LED Screen Display: Current voltage and remaining power. Package List: 1 x Wireless Tattoo Power Supply1 x USB Charging Cord