ISOTrio Tourmaline Ceramic Twister Curling Irons SetFeatures: ON/off temperature control 50-210CPower LED indicator Electric hair tube size: 19mm 25mm 32mmVoltage: 110-240V 60/60HzPower: 45WAdditional Feature:Far infrared technology developed by NASA Tourmaline crystal stone injected and mixed into plates, which increases the ion levels to the highest known to the beauty industry, Ceramic tourmaline plates 700% more ionic then a regular curling iron Ionic-freeze control