Feature: 1. Voltage Adjust: Tattoo power supply with 4 to 12V can be adjusted, the adjust accuracy is 0.1V, which can meet the speed needs of different tattoo parts. 2. RCA Interface: Wireless tattoo battery adopted RCA port, suitable for most standard RCA tattoo machines, provide firm connection, not easy to fall off. 3. 2000mAh Capacity: Tattoo pen power supply built in 2000mAh large capacity battery, fully charged state can work continuously for 6 to 8 hours, suitable for large area tattoo. 4. Display Screen: Tattoo power supply is equipped with LCD screen to display the current voltage for convenient use, which has shutdown, over charge, over release protection. 5. Easy To Use: Wireless power supply get rid of the shackles of power cord, clip cord, foot pedal, which make the power supply and your tattoo pen integrated for easy operation. Specification: Item Type: Wireless Tattoo Power Supply Material: Aluminum alloy, electronic components Interface: RCA Interface Battery: 2000mAh Lithium Battery(Included) Size: Approx. 7.2 x 3.2cm / 2.8 x 1.3in Input: DC5V 2A(Input voltage shall not be higher than 5V-2A) Output: 4-12V Output Voltage Adjustment Accuracy: 0.1V, long press can be quickly adjusted Display Screen: Display Current Voltage Charging Time: 2-3 hours (It is forbidden to charge with charger higher than 5V) Use Time: Use for 6-8 hours . Package List: 1 x Wireless Tattoo Power Supply1 x USB Charging Cord