Modular pen style tattoo machine with 3,5mm and 4mm stroke and it can be used as a wireless tattoo machine or battery unit can be swapped out to RCA connection module and worked wired power supply. Also cartridge needles provided by same brand and don’t let price spook you because they are available in boxes of 50 units.
If you want to but this tattoo machine or cartridge then links to products are in video description on YouTube