This Self-Stirring Mug is made from durable stainless steel metal. Included lid great for use as a travel mug. Quickly blends beverages without the effort of shaking or stirring. Great for the office- Car- Travel- Home & more. ****Features:*** Holds Up to 15 ounces of Liquid*** Durable Stainless Steel Metal Construction*** Quickly Blends Beverages without the Effort of Shaking or Stirring*** Battery Operated (Requires 2 AAA Batteries- Not Included)