SusieQ, it's a UV light for setting gel nails. I work in health care, hand sanitizer and lots of hand washing, which result in dey cracked and bleeding cuticles. I used to get manicures to combat this. Then Covid came along. I found my light on Amazon, along with the supplies, and voila, I am able to still get gel manicures, just at home now. You have to buy UV light polish. Regular polish doesn't last for me due to the hand sanitizer and washing, it would chip within a day, UV light gel last 2-3 weeks. It works for me, even doing my nails at home, no cracked bleeding cuticles.