Expresso Yourself Self Stirring Coffee Mug, Automatic Cup, Battery Powered Mug, Tea and Beverage Mug, Black, BPA Free SELF STIRRING TECHNOLOGY- Features high powered self-stirring technology that will easily mix any beverage that you desire. UNIQUE DESIGN- This one of a kind play on words design will be a sure conversation starter! HIGH QUALITY- Features a stainless steel interior and a strong plastic exterior that is built to last. MULTI PURPOSE- Whether its coffee, tea, or any other beverage, this mug is sure to stir it to perfection. GREAT FOR TRAVEL- Use the travel lid to sip your morning coffee easily and comfortably while on the go! Holds 13.5 fluid ounces.