This is a new arrival fast heating hair straightening tool with negative ions hair protection system. While the hair straightener is working, some of the negative ions cover the hair surface, some shifts into water when it touches air, offers hair a protection mask-ant.settings of this hair straightener achieve the effect of straight hair by temperature setting. There are 11 temperature settings options. Every touch gets 5? change .we recommend you always start at the highest temperature setting and reduce the level of heat as your hair required. 1. For thick hair, select higher temperature (210-230?) 2. For normal textured hair, select moderate temperature (190-210?) 3. For delicate, fine hair, you can select temperature (170-200?) select low temperature will be slightly slower to make a hair style. Boot-- Press the power button 3 seconds, and press 3 seconds off