Tourmaline and ceramic, natural sources of negative ions and far infrared heat, eliminate frizz, seal in moisture, and leave hair smooth and shiny. LCD digital display, adjustable temperature between 160 °F - 450 °F (71 °C - 232 °C). Floating plates provide perfect tension for gripping the hair really well. Curl: 160 °F - 400 °F (71 °C - 204 °C). Smooth: 160 °F - 450 °F (71 °C - 232 °C).