packing list: 1. dr.pen m8-c device *1pcs 2. 12 pins cartridges*2pcs 3. adapter*1pcs 4. charger*1pcs 5. manual*1pcs 6. cable*1pcs 3 slot connector , 6 speed level , 16pin new cartridges , digital display , adjustable depth 0.25-2.5mm the derma pen is an automated micro-needling device with a disposable tip cartridge that is made up of 12 micro-needles, which uses proprietary technology to penetrate vertically into the skin. the stamping action of the dermapen's vertical tip creates invisible micro-injuries to the skin,while stimulating the skin's natural ability to heal itself and increase the production of new collagen. in doing so, these micro-injuries encourage and harness the body's innate ability to regrow and repair the skin through normal physiological processes and the skin becomes rejuvenated and refreshed..syi