Electric Mixer: Set it apart from any other automatic mixing jar. The high-quality fluid motor works quickly with the push of a button. Electric Mixer: Set it apart from any other automatic mixing jar. . The high-quality fluid motor works quickly with the push of a button. Lid Included: High-grade silicone seal holds your mug tightly in place and keeps your drink hot or cold for about 3 hours. The hole in the lid allows you to use the straw to sip coffee and more. BATTERIES NOT INCLUDED: This product requires AAA batteries to power (need to purchase it yourself) EASY TO CLEAN: If you don't need the stirring function, our stainless steel coffee mug can be used as a normal drinking cup and is also easy to clean, but do not use in the dishwasher or fully soak to clean. Auto Mix: We put the on/off button right above the thermos so it's easy to open and reach with your thumb, just press the auto mix button on the mug and the propeller on the bottom will spin up and mix the solute and solvent particles into into cute bubbles.