Product Description ISO 5 Piece interchangeable Tourmaline Ceramic Twister Curling Irons Set Features: ON/off temperature control 50-210C Power LED indicator Electric hair tube size: 13mm, 19mm, 18-25, 25mm 32mm Voltage: 110-240V 60/60Hz Power: 45W Additional 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 . Also included a free thermal heat protective glove.