Product Name: Best Microneedling Pen Derma Roller Pen Korea Derma Microneedle Dr. Pen Ultima with Needle Cartridges for Scar Removal Portable: Handheld Application: Salon, Home Theory: Derma Roller System Type: Skin Care Product Description Unlike the conventional skin treatment remedies, you do not have to spend a fortune on the derma pen. It is least expensive. The sharp needles on the derma pen will create miniscule pores on the uppermost layer of the skin. This in turn will enhance collagen production and will replace dead skin tissues with new skin cells. One of the greatest advantages of using the derma pen is that you do not have to wait for long to see visible and better results. It is easy to use the derma pen. You just need to follow the instructions on the manual that comes along with the kit of the derma pen.The needles are sterile and you do not have to worry about any infection or skin allergies. This also a great advantage of the derma pen, as the usage of other derma pen in the market can cause pain and will create rashes when you use them. Hereafter, you do not have to bother about fixing appointments with busy dermatologists or visit their overcrowded skin clinics. You can use the derma pen at the leisure and comfort of your home. The device is compact and you can easily carry it while you are on a business trip or while you are on vacations.ModelnameDr.penInput&OutputAC100~240V,50~60Hz/DC5V,1000MAAdapter5V,1000mANeedlesnumber9PCS/12PCSNeedlelength0.25-3.0mmNeedlespeed6000~12000RPMSpeedcontrol5LevelNeedlesmaterialSurgicalstainlesssteel/NanoWaferWeightMainbody56gSize157*30(mm)It starts from the lowest to the highest, when you turn on the power firstly. The speed cycles low to high. When you need to stop the machine, please back to '0' level!Adjustment of needle length you can adjust the length of needle by turning the adjustment ring clockwise or counter clockwise, length of it will be longer. Turing it counter clockwise, length of it will be shorter