Dragonhawk Fold Tattoo Pen Machine 2.4mm-4.2mm 7 Strokes Length. Utilizing a convenient click system, artists can enjoy up to 7 stroke length options for a wide variety of procedures, including lining, color packing, shading, and more. This convenient system allows artists to keep the Fold pen bagged while making stroke length adjustments, ensuring uninterrupted and seamless tattooing. Gently and smoothly transfers ink to skin; suitable for all skin types. Mast T1 Wireless Battery Tattoo Power Supplies. Short press power ON, press + and - to adjust voltage,0.1V voltage adjust. Long press Power and "-" button together, If show B0 on the screen, that mean start-up function open. Long press Power and "-" button together, If show B1 on the screen, that mean start-up function off. Big battery capacity 1350mAh, can use for about 3-5 hours.