The 380ml coffee mixing cup is made of stainless steel and ABS plastic, with a silicone bottom for stable, non-slip use. When adding hot water or rotating, the rotor remains centered to help prevent accidental spills. Features: [Useful] The automatic mixing cup uses magnetic force and fluid self-stirring technology to mix liquids efficiently. [With Lid] Includes a sealed cover to help prevent liquid from spilling. [Not Off-center] The self-stirring mug has a fixed rotor design that stays centered during operation. [Easy to Use] Simply press the switch to activate mixing. [Widely Applicable] Suitable for mixing coffee, milk, juice, medicine, protein powder, and more. Ideal for home, office, or outdoor use. Specifications: Color: White; Coffee (Optional) Material: Stainless Steel, ABS Capacity: 380mL Battery: 2 x AA Batteries (Not Included) Occasion: Home, Office, Outdoor, etc. Package Size: 15 x 12.5 x 11.5 cm / 5.9 x 4.92 x 4.52 inch Package Weight: 350g / 0.77lb Package List: 1 x Self-Stirring Mug