About this project Ergonomically designed to fit most vehicle cup holders. The 12V stainless steel car heating cap fits snugly in your car cup holder and plugs into the cigarette lighter to keep your drinks warm. The heating function is practical and maintains a temperature of 65C. No batteries required, just plug in the dash lighter. Note: The input power of this product is 60W (12V / 5A). Before purchasing, please confirm that the output power of the cigarette lighter is greater than 60W, otherwise it will stop working due to the overload protection of the cigarette lighter Thermostatic Technology - Automatic Electronic Heating Travel Mug, 450ml 15.2 fl oz capacity is enough for personal use, designed to heat and keep hot water, coffee, milk, tea or other beverages warm at the right temperature around 65 degrees. VEHICLE SPECIAL TOOLS - Excellent insulation, sturdy plastic handle, includes a detachable standard 12V car adapter car cigarette lighter plug, works with all car power sources, has a cord long enough to fit inside the car and fits most car cup holders. Leak-proof and non-slip bottle heater: The lid is designed with a sealing rubber band to prevent liquid spillage and improve heating efficiency; non-slip rubber base to keep the cup stable.