Put a smile on your face first thing in the morning. Add hot liquid and watch the battery charge. As mug cools battery changes back to black.
- HEAT ACTIVATED - Pour in hot liquid and watch the Battery fully charge. This color-changing mug contains great quality and durable heat activated print on both sides. In order to activate the mug the temperature of the hot liquid should be over 70°C/158°F. At that temperature the color of the mug will change and the battery will charge up. Also indicating at what level your drink is at as well as if it it still hot.
Hand Wash Only. Not dishwasher or microwave safe. 10 oz ceramic mug. Shipped in a gift box.