Dragonhawk Mast Fold Pro Wireless Tattoo Pen is designed with 7 adjustable stroke lengths for all types of artists and work.The battery capacity of 1500 mAh enables artists to work for a long duration of 2-5 hours*. If the battery is low, the RCA connector can be  used instead. The machine offers the opportunity to work both wirelessly and wired with an RCA cord when needed.Simple operation: LED screen shows battery, timing, and voltage. Voltage can be easily adjusted by pressing buttons on the battery pack.Instant start-up function: Start-up function will be automatically activated at power on. Starts up larger groupings and cartridges with a tight membrane easily.