Magic Morning Coffee Mug, Yellow 12 Oz Heat Sensitive Color and Face Changing Ceramic Tea Cup, By Chuzy Chef MAKES YOUR MORNING MORE FUN: Beat the sadness that the morning brings with this exciting Magic Coffee Mug. As it changes from sad to happy so will your mood! So fill it up and be ready to smile! HOW TO ACTIVATE COLOR CHANGE: In order to activate cup the temperature of the hot liquid should be over 70C/158F5. At that temperature it is possible for the color of the mug to change. SLEEPY FACE TO AWAKE FACE INSTANTLY: This Magic Morning Cups faces change as soon as heat is applied. Watch as your cup goes from dark and sleepy to yellow and awake and happy! KEEPS TRACK OF COFFEE TEMPERATURE: Dont you hate it when you take a sip of your morning coffee and its cold? Well with this cup you dont have to go through this unpleasant experience anymore. As your coffee cools off, your mug turns back to black! 100% CUSTOMER SATISFACTION GUARANTEED: Chuzy Chef guarantees that you will always be satisfied with your purchase from us. We only use the best materials for our products and are always available to aid our customers.