This product doesn't work at all. I understand the concept behind it, but clearly the R&D people really didn't give this much thought. I compare it to using a 20-year old serrated steak knife on my face. It doesn't cut any hair at all, and I know this because I used it while looking in my 10x mag mirror. Neither hair nor skin would budge. I'm not willing to scrape the heck out of my face to give this a second try, so in the garbage they go. Good thing they were cheap.