Calunce Magic Morning Coffee Mug Heat Sensitive The light bulb lit Tea Cup,I love U cup Expressing Love Makes your morning more fun : Beat the sadness that the morning brings with this exciting Magic Coffee Mug. As the bulbon it changes to lit! So fill it up and be ready to Campaigning! We only use the best materials for our products and are always available to aid our customers. Water temperature should be over 70C/158F,the color will change. No microwave. No high temperature. No direct sun exposure. No high heat of dishwasher. Perfect for coffee,tea and hot chocolate,share with your family and your lover.