Great little device! [SEP] I just got this today and couldn’t wait to try it. I only charged it a short time.  I was very skeptical about buying one that’s so inexpensive. My nails were badly damaged somehow and had deep ridges and bumps on the surface. I really wasn’t expecting it to do much. Wow was I wrong! My nails aren’t perfect buy they’re so much better and whiter than they ever are! It seems pretty well built and durable. I love that it’s lightweight and portable. You definitely can’t beat the cost. Don’t hesitate buy one!