About this product [Unique design] This self-heating coffee cup is powered by USB 5V and features a built-in ceramic heating element in the base for efficient heating without burning hands. When placed on the power base, the heating and insulation functions activate automatically, maintaining your beverage at an optimal temperature of approximately 60°C when used with the lid. [Best material] Made from high-quality food-grade 304 stainless steel, this heating cup is smooth, durable, scratch-resistant, and easy to clean. The lid includes a sealing ring to help prevent leaks and dust, supporting long-term heat retention. [More fashionable] Features an innovative LED lighting effect with a soft blue glow that gradually changes, providing visual appeal and visibility in low-light environments. The LED indicator shows when the heating cycle is active, allowing convenient use at night. A non-slip mat ensures stability on flat surfaces for safer, more comfortable use. [Note] This mug heater does not include a built-in battery and must be connected to a power source to operate. A 5V-2A charging adapter is recommended. Designed primarily for keeping hot drinks warm; heating cold liquids may take longer. Color: Black Material: Double-layer 304 stainless steel + PC + PS Due to variations in manufacturing batches, minor differences in color or accessory appearance may occur, but these do not affect functionality. Package Contents: 1 x mug, 1 x cup lid, 1 x bottom tray, 1 x USB charging cable Only the items listed above are included; other accessories are not included. Note: Lighting conditions and display settings may cause slight variations in the perceived color of the product. Measurement may vary by up to +/- 1-3 cm.