HOW TO USE: Scroll down the page for our how to use guide. Then replug and your Diffon should turn on. For wavy, curly, coily hair (Type 2, 3, 4). Hair Type Wavy, Curly, Coily (Type 2, 3, 4) Long/Thick Wavy, Curly, Coily (Type 2, 3, 4).