APXC Hotspot Color Changing Thermometer Heat Sensitive Porcelain Tea Coffee Milk Mug Material:High quality ceramic,more healthy than plastic cup Pour in a hot tea or a hot coffee and when the WiFi logo turns blue, you're ready to surf Can placed at dishwasher and microwave. Hot spot is 10-ounce mug decorated with heat-sensitive color-changing ink that goes blue once it warms The mug is ceramic, sturdy and will let everyone know how fast you are moving