This machine has a visible LCD voltage screen, easily adjustable voltage. Takes 2-3 hours to full charge, runs for upwards of 8-12 hours, standard 3.5mm stroke length, works as a alrounder Effortless to cover and protect. Efficient cartridges change and replacement. This wireless tattoo pen advanced gear system that smooth, soft, and quiet operation, ideal healing results. Flexible and lightweight for every style gently and smoothly transfers ink to the skin; suitable for all skin types.