The Bamboo Mug Warmer with 8 oz Ceramic Mug, powered by USB, keeps beverages warm at up to 131 degrees F 55 degrees C. Crafted of eco-friendly bamboo, it has a built-in MCH ceramic heating element for efficient heating and the bamboo base ensures circuit protection. Includes a 3.3 ft USB to USB Type-C cable. Hand wash ceramic mug and spot clean bamboo lid and base. FCC certified. Drinks enjoyed at the perfect temperature with this environmentally conscious and technologically advanced solution.