Cool Color Changing Magic Mug - Funny Coffee & Tea Unique Heat Changing Sensitive Cup 12 oz Yellow Happy Face Design Drinkware Ceramic Mugs Cute Birthday Idea for Mom Dad Women & Men KEEPS TRACK OF COFFEE TEMPERATURE: Dont you hate it when you take a sip of your morning coffee and its cold? Well with this unique coffee mugs you dont have to go through this unpleasant experience anymore. As your coffee cools off, your funny coffee mug turns back to black! MAKES YOUR MORNING MORE FUN: Beat the sadness that the morning brings with this exciting Color Changing 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 funny coffee mugs the temperature of the hot liquid should be over 70C/158F5. At that temperature it is possible for the color of the coffee mug to change. 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. SLEEPY FACE TO AWAKE FACE INSTANTLY: Both of these Magic Morning Cups faces change as soon as heat is applied. Watch as your heat changing mug goes from dark and sleepy to white or yellow and awake and happy! Our large coffee mug is great as fathers day coffee mug, teacher mug, coffee gifts, coffee mugs for men, fathers day mug, coffee lovers gifts, boyfriend birthday gifts, mothers day coffee gifts, men's gifts for christmas, father's day mug, gifts for brother or sister.