1Voltage Adjust: Tattoo power supply with 6V, 7V, 8V, 9V, 11V can be adjust, meet the speed requirements of tattoo artists to operate different parts. 2RCA Port: Tattoo power supply adopted standard RCA interface, compatible with all standard RCA tattoo machines, with tight connection, not easy to fall off. 3Convenient Operation: Get rid of the traditional power supply to use power line, tattoo clip cord, tattoo foot pedal to work , make your work more convenient. 4Large Capacity Battery: Built in 1300mAh li battery, under full charge and 8V operating voltage state, this RCA tattoo power supply can continue to work for 8 hours. 5Multifunction: Tattoo pen battery with shutdown, over charge, over discharge protection function, with indicator light flashes to show the charging status, which is lightweight for convenient use.