? Made of high-quality environmental friendly PC materials, suitable for your phone and easy to install or remove, providing you with a good grip. ? The color changes when the temperature exceeds 28 degrees Celsius and returns to its original color after cooling. ? Thermal discoloration is a physical change, not a chemical reaction, and therefore harmless to the human body. ? The intelligent design allows you to plug in the charger and access all essential buttons and functions without removing the case. ? The matte texture bumper edge is designed to prevent from slipping and falling, making it easy for you to hold.