Applications: 1. Choose temperature in 210-230 degrees Celsius for fine hair. 2. Choose temperature in the 190-210 degrees Celsius for general hair. 3. Choose temperature in 170-200 degrees Celsius for soft hair. 4. If you set low temperature perm, molding may be a little slow. 5. Please press on-off key and hold for 3 seconds to turn it on, and press on-off key and hold for 3 seconds to turn it off. 6. You can switch Form C to F by pressing the ‘+’ and ‘-‘ buttons together; press again to switch back. Instructions: 1. Please keep hair dry and neatly groomed before using it. 2. Insert the plug into the proper socket. 3. Turn it on and adjust the temperature, you can use when the temperature reach what you want. 4. If you want to keeps straight hair last longer, please use hair styling lotion and softener lotion and wash clean before hair straightening.