The result is perfect but the product is not easy to use.I returned my first purchase and replaced because it came with open needles and box.They sent me second one while it was close completely. I checked each part and looked good but after I started to use, the bottom doesn’t work and didn’t change more than one, even I couldn’t turn it off. I had to let it works until out of charge and then charge it completely. So it works good again, however about two hours it works until went out of charge...