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They are 230 degrees and they leave NO smell in my hair at all! I use this amazing Tresemme heat spray to protect it, around £5 or 2 for £7 at tesco at this link: http://www.tesco.com/groceries/Product/Details/?id=262485940 They heat up in no time at all & the great thing is you can control the temperature, so I use them on the highest setting for most of my hair & then turn them low to do my fringe, where my hair is allot finer. I also only had to run through my hair once, to get it so perfectly straight, and it perfectly stays straight throughout the whole day. For reference I have very thick naturally wavy hair. Curling my hair with these is so easy and makes beautiful curls as the whole red shiny outer bit is so sleek it doesn`t drag on your hair. These are excellent straighteners, at an affordable price as there around £80. But right now in Asda they are half price online for only £39 at this link: http: //direct.asda.com/Nicky-Clarke-NSS028-DesiRED-230-Degrees-Straightener/001557960,default,pd.html ! I hope you found this useful, E xo