4. Fast charging: The self-mixing coffee cup comes with a USB cable and requires no batteries. It can be connected to any USB port. 2. safety material: the inner tank of automatic mixing cup is made of stainless steel, the cup body is made of ABS, resistance, can keep warm, not leak, not heat, easy to clean. 1. automatic quick mixing cup: This is a portable automatic mixing cup. Just add your favorite powder such as coffee, butter, etc. into the mixing cup, the button to stir automatically, automatically stop after . 3. Versatile: Automatic stirring cups are perfect for stirring coffee, tea, hot chocolate, milk, protein shakes, lemon juice, broths, and many other lightly mixed drinks. 5. The : Self-stirring mugs are the easiest way to mix hot or cold drinks and make the for family, friends and colleagues. Suitable for living room, bedroom, car, , gym, etc.