This is world wide the first App for control your tattoo machine!- two modes "Rotary" and "LOD"- in tab "Rotary" is the start mode for "thunder" integrated - You don't need start-up cable!- presets for linig and shading and other user settings- adjustable step for the output voltage and frequency- you can use the slider or the "up" and "down" buttons for settings- the app runs in the background - You can watch your tattoo stencils!- intuitive user interface - easy to use