I picked this product becuase I was looking for a file with some different attachments and then noticed it has a UV light too! Ive wanted one for a while but didn't want to invest a whole lot until I knew if I liked it so Im glad I found this little gadget. It works great. Remember to take the little plastic strip off the battery thats included for the UV light. You do need your own battery for the file but thats no big deal. I love that its so small I pack it in my bag for trips too!