Features: Used to automatically stir coffee, tea, hot chocolate, soups etc. No water leaking into battery base when filled with water. Inner material of healthy PP, high temperature resistance. Outer material of stainless steel, durable and shining. One plastic ring around the lid for lidding tightly. Powered by 2 AAA batteries (excluding). One button for power-on. Specifications: Material: PP, stainless steel Color: Yellow Capacity: 350ml Power: 2 AAA batteries (excluding) Product size: 8.8 * 11.9cm / 3.5 * 4.7in (external diameter * height) Product weight: 255g / 9oz Package size: 13.5 * 12 * 9.3cm / 5.3 * 4.7 * 3.7in Package weight: 303g / 10.7oz Package including: 1 * Self-stirring Mug with Lid