BATTERY OPERATED: This’s an temperature sensitive auto mixing cup, require 2 AA batteries operated( included), does not need to be plugged in. NOT OFF-CENTER: The automatic mixing cup adopts the design of fixed rotor. When adding boiling water or rotating, the rotor will not deviate from the center, which can avoid the risk of accidental eating. MATERIAL: The automatic mixing cup is made of food-grade ABS and food-grade 304 stainless steel. The double-layer design of the cup body will not burn your hands when the boiling water is poured into the cup. APPLICATION: The cup is suitable for stirring for instant coffee with coffee mate creamer, coco mix, chocolate, honey, syrup, sugar crystals, etc. It is not suitable for stirring thick, pasty, ice cubes, oatmeal and other solids that cannot be dissolved quickly.