Features: The tattoo pen is made of aluminum alloy, solid and sturdy, lightweight for you to carry easily. Adjustable voltage.According to indicator light, you can clearly observe the voltage you has adjusted, all gears present exceptional performance. Simple operation, convenient to use. Used for most all standard RCA connect tattoo machines. This tattoo pen is a top choice for professional tattoo artist. You will get the practical tool, it is also a great gift for tattoo lovers. Specifications: Output interface: RCA interface Stroke: 3.5mm Voltage: 5V-12V Speed: 12V 10000rpm Material: Aluminum alloy Optional Color: Silver,Blue,Black Size:app. As picture shown Quantity: 1 pc Package Includes: 1 x Tattoo Pen(other accessories demo in the picture is not included.) note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!