From Brookstone, this smart mug features: Stainless-steel mug with 16 ounces beverage capacity fits most cupholders Maintain beverage temperature in the car, home or office with USB powered heat Set any temperature between 68ºF and 176ºF with the onboard controls Easy to read temperature display lights up day or night and vanishes completely when not in use Spill-resistant lid locks in heat, avoids spills and features a flip-top sip closure Tapered design is sleek, stylish and easy to clean 12 volt Imported.