Ambition is a professional tattoo supplies manufacturer, we focus on the quality of the tattoo machine and the actual good operating experience, provide high quality service and product for the tattoo artist. Key Features: Motor: Ambition coreless Japan motor Stroke: 4.0mm Operating Voltage: 5-12 V One Battery capacity: 2200 mAh ( rechargeable lithium battery battery) Battery working time: 6-8 hours Charging time: About 2 hours Replaceable stroke cam 13 level voltage output Ergonomic grip design Minimal vibrations and low noise Accepts all major cartridge brands This rotary tattoo machine kit are great for color packing,fine lines,smooth black grey, realistic color, traditional style 3rl work and more, it's your all-in-one machine if you are an artist that does such work.it has powerful motor precisely paired with 4.0 stroke. 35mm grip makes you more comfortable at work, of course, it can be used with all major cartridge brands as well as Ambition cartridge system. The grip support rotation adjustment and accurately lock the needle depth Power-pack key features: Display in which you can view voltage, Remaining battery reminder and working time. Adjust output voltage: Press the "+" or"-" key to adjust output voltage. The voltage can be adjusted through button (+) and (-) respectively with the voltage of 0.1V on each press (Long press ± 0.5V). The motor of this cordless tattoo gun has excellent performance for color packing, which can improve your work efficiency, at the same time, this customized motor will cause less damage to your customer's skin than other machines, which will make you win a good reputation. When you need to change the stroke, it is easy to control and very convenient.