ELECTRIC MIXING CUP: The automatic mixing cup is the best and easiest way to mix hot or cold drinks! Mixing cups with lids allow you to take drinks from the kitchen to the living room, bedroom, car, office, gym, school, etc. NO POWER CONNECTION REQUIRED: Self-mixing coffee mug, just install 2 AAA batteries to use it (not included). The bottom is sealed with a rubber bottom cover and has some water resistance. EASY TO USE: With advanced self-stirring technology, press the automatic stirring button on the cup, and the propeller at the bottom will rotate to mix the solvent and solute particles into a delightful foam. If you press the button again, it will stop stirring. NOT OFF-CENTER: The self-mixing cup adopts the fixed rotor design. When adding boiling water or rotating, the rotor will not deviate from the center, which can avoid the risk of accidental ingestion. EASY TO CLEAN: If you don't need the stirring function, our stainless steel self-stirring coffee mug can be used as a regular water cup. It is also easy to clean. Just use tap water to clean it.