[Best material] This heating cup is made of high-quality food-grade 304 stainless steel, , smooth and sturdy, scratch- and easy to clean. The cup lid comes with a sealing ring to maximize leakage and dust prevention, helping to maintain the ideal temperature for a long time. [ design] This self-heating coffee cup is powered by USB 5V, and the bottom of the heating cup has a built-in ceramic heating , which heats faster and not burn your hands. When the cup is placed on the power base, the heating and insulation functions are automatically activated, keeping your drink perfectly hot at about 60℃ (with lid). [More fashionable] Innovative lighting effect design, the blue LED indicator light changes automatically and gradually, giving you a of vision. The LED indicator of this heating cup tell you when the water is ready, and you can easily heat coffee even in the dark night. The non-slip mat ensures that the mug heater is stable on the desktop, which is more considerate to use. About this product [Note]This mug heater does not contain a built-in battery and needs to be connected to a charger to use. It is recommended to use 5V-2A charging method. This heating mug is designed to keep your hot drinks warm, and it takes a long time to heat cold drinks.