Encell Stainless Steel Travel Mug 12V Car Heating Cup This stainless steel cup plugs into your car's cigarette lighter and maintains a temperature of 60C - keeping your tea or coffee warm and drinkable while you're on the travel Ergonomically designed, fit most vehicle cup holders. Cup of Diameter: 8.5cm Cup bottom Diameter: 6.5cm Material: Outside:stainless steel,Inside:Plastic 12V car mug does not re-heat cold drinks. Heat function and practical, maintains a temperature of 60C. Safety lid, the water will not overflow no matter drinking or placing. Slippery resistant base, it will not slide easily when used in the car . Keeps coffee, tea, water or other beverages warm This Stylish Brushed Stainless Steel Mug Will Keep Any Hot Drink for Hours.