Multi-functional Magnetized Stirring Cup, Self Stirring Coffee Mug, Automatic Stainless Steel Travel Coffee/Tea/Hot Chocolate/Milk Mug, 12.9 OZ Rechargeable Cup for Office/Kitchen/Travel/HomeSelf-Stirring Technology: Uses a small magnetic capsule (pill) at the bottom to spin and mix liquids automatically.Design: A 380ml capacity with a stainless steel interior and a plastic/ceramic-style exterior.