First of all, I was so excited for the device I am skin care obsessed. I have a professional Micro-Needling pen that come with all the 12,36,and Nano chips. I ordered this to treat my skin and my self after a hard work day. Do some Nano treatment and then my favorite face sheet mask. When I start using it I was not sure if it do any thing to my skin it is not painful at all so I contacted the customer service and I request a return. And they were so sweet and understanding and send my the information that I need. They offer me to keep using it and see if any thing change so I did, I Nano then I put my Vitamin A serum and then I was shocked from the results, my skin looked amazing and the serum gets more effective than before. So I changed my mind and I will never stop using this amazing cutie device.