Dragonhawk Fold Pro Wireless Tattoo Machine features an adjustable stroke length mechanism to quickly switch between 7 preset stroke options. High capacity of battery: Run time of 4-6 hours with 1500mAh capacity battery. Machine can also be run from RCA backup. Simple operating system: LED screen shows battery, timing, and voltage more clearly. Artists can easily adjust the voltage by pressing buttons. Instant start-up function: Start-up function will be automatically activated at power on. Even large rows of needles can be used easily. Variable stroke: 2.4, 2.7, 3.0, 3.3, 3.6, 3.9, 4.2mm – For all artists from eyeliner to brows to SMP! Features: Weighs 200g (with battery or RCA) LED screen showing battery, timing and voltage 2.4 to 4.2mm adjustable stroke length 4-6 hours battery from a full charge Includes mast fold pro machine, mast fold pro battery, USB-C charge cord, RCA cord (for using with a power supply) and replacement o-rings Accepts universal needles Tech specs: Machine Diameter: 32mm Machine Length: 128mm (machine with battery) Speed:8V/6500rpm Working Voltage: 4-12V Charge time: 1.5 hours to full Available in full black. Additional batteries are available for purchase, Dragonhawk Fold Pro Battery only.