450ml Car Heating Cup Stainless Steel Electric In-car Travel Heating Cup 12V Heated Thermos Mug for Heating Water Coffee and Tea. The car heating cup is powered by a 12V cigarette lighter plug, allowing you to effortlessly enjoy a hot beverage while on the road. Crafted from food-grade stainless steel, the electric in-car travel heating cup guarantees the safety and hygiene of your drinking water.