High battery capacity: With its 1500mAh battery, enjoy 4-6 hours of uninterrupted tattooing. Replaceable RCA connector for continuous power.Simple operating system: The built-in LED screen displays battery status, timing, and voltage, while convenient buttons allow for easy voltage adjustments.Instant start-up function: It features an automatic start-up function that activates upon powering on, enabling artists to easily work with large rows of needles to meet their diverse tattooing needs.Variable stroke: 2.4/ 2.7/ 3.0/ 3.3/ 3.6/ 3.9/ 4.2 MM¨CFor all artists from Tattoo to SMP.