From ingredients to an even drink
Pour the liquid into the mug first, then add the powdered ingredient. Pressing the switch starts the magnetic stirrer so the liquid circulates through the cup. Press the switch again once the mixture reaches the desired texture.

Suitable everyday drinks
The seller lists coffee, tea, hot chocolate, milk drinks, protein shakes and other powdered drinks. Mixing results naturally depend on the amount and type of ingredient, so add powders in a sensible quantity for the available liquid.
What the button changes
The main convenience is that mixing happens in the same cup used for drinking. That reduces the need for a spoon or separate shaker during a desk, breakfast or post-workout routine.