I have gained this device, because I have a natural wave that I've formed either straight or curly with the smoothness of iron. Since I've read that as a hot air thermal brush your hair hurts less than a smoothness iron, I ordered the device. Unfortunately it does not work with my hair. Neither smooth nor curly nor external or internal waves. My hair is not at all take part and after processing they are also totally fluffed. In addition, I had to try about 4 find that they now are totally broken at the tips. I would like the equipment returned, but wanted it but then try a few more times with different styling products (hair mousse, smooth serum, etc.). No longer at home otherwise I would have the device - so I had to elapse the return date.