The 400ml coffee mixing cup is made of stainless steel and plastic for a long time of use. When adding boiling water or rotating, the rotor will not deviate from the center, which can avoid the risk of accidental eating. Features: [Useful]The automatic mixing cup uses fluid self-stirring technology to stir the liquid in the cup. [With Lid]With a sealed mug cover, no need to worry about liquid splashing. [Not Off-center]The self-stirring mug with the fixed rotor, not the off-center fixed rotor, not off-center. [Easy to Use]Just press the switch to quickly cool down and shake the drink. [Widely Applicable]It can shake and cool coffee, milk, juice, medicine, protein powder, etc. Suitable for men, women, the elderly, children, and students. Specifications: Color: White; Black (Optional) Material: Stainless Steel Capacity: 400mL Battery: 2*AAA battery(Not Included) Occasion: Home, Office, Outdoor, etc Package Size: 13*10.5*8.8cm / 5.11*4.13*3.46inch Package Weight: 350g / 0.77lb Package List: 1 * Self Stirring Mug