This is a new arrival fast heating hair straightening 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.How do you use this hair straightener?Different 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.