Multi-Purpose BPA FREE! Portable Mixer Self Stirring Auto Mixing Tea Cup Coffee Mug Protein Shaker Mixer Blend All Your Favorite Protein Shakes, Mix Drinks,Cocktails, Coffee Juice Transparent with leak proof lid, 16o Portable and Easy To Use Perfect for Gym, Home, Office and Travel Built in mixer automatically mixes drinks with the press of a button Battery Operated (AAA)