The Innokin Kroma Kit is a simple and easy-to-use device. The Fire and Adjustment buttons are located conveniently for quick access. You can quickly adjust the Variable Wattage (VW) and Temperature Control (TC) settings for Stainless Steel, Nickel, and Titanium coils using the traditional OLED display panel. If you have a proper TC atomizer, you can change the TC wattage on the Kroma mod. The OLED panel also displays your firing voltage and a vape timer.