Dr. pen Ultima M7 microneedling pen is used mostly for face wrinkles, scars, stretch marks and facial lines. Dr. pen uses sterile, individually-sealed, disposable needle cartridges for optimal safety and comfort. The adjustable dial allows treatment that adapts to individual client’s needs. (Notice that the maximum depth depends on your cartridge's type) Dr. pen is more economical than derma roller, you just need to recharge the pen and replace cartridges after every use. The battery of Dr. Pen Ultima M7 is built-in. Both wired and wireless can be worked. What in the Box: Dr. pen Ultima M7 micro needling pen, 2pcs 12-pin replacement cartridges, EU wall charger and cord, user manual, storage box