Advantage: This Tattoo Pen is designed to give you the closest feel to an actual pen that you can get with a tattoo machine You can use this tattoo pen machine to do tattooing,permanent eyebrows makeup,lip line,eye line...All in one pen Each of the Tattoo Pen is CNC-Machined by aircraft Aluminium alloy and then anodized finish The motor is 10W made in Taiwan,low noise,strong and stable to work, no hot for long time working Specification: Operating Voltage: 7–12V DC Rpm range Stitches/Sec:8V-8000rpm,min 8-800/sec Stroke: 3,5 mm Needle Protrusion: 0 - 3,5 mm Connection: DC 5.5mm connection line,free plug adapter to fit all brands power supplies. Package including: 1 Tattoo Pen,1 DC 5.5mm connection line Notice: Please keep the pen working under 12V to protect the rotary system and the motor This tattoo pen must be worked with the tattoo power supply, it can't be worked with the adapter