Material: Aluminum alloy Straight Bar Drive Stroke Cam: 3.4mm&3.8mm Motor: brushless motor, not only long lifespan,Durable motor Precise parts and professional design Brings longevity and quiet running A direct drive tattoo machine pen that performs well for both lining and shading, and is also very quiet to run and creates more lower vibration. Straight Bar Drive Stroke Cam,offers powerful hitting, less resistance. Motor Speed: 8V - 10000RPM Power Supply: 4.5-12 Volts; 56-168 Hertz The ambition vibe machine displays your machine speed in both Hertz & Volts. When you adjust the volt, the hertz will be changed too. Hertz allows you to know the current speed of your machine more precisely. Single Battery Capacity: 2400mAh (4800mAh for 2 batteries) Charging time: about 2-3 hours One battery operation time: More than 8 hours (16 hours for 2 batteries) LED display content: output voltage range + working time + battery usage+Hertz