Material: CHB carbon fiber heating material. Blue color Voltage : 12 V DC Maintaining temperature: approx. 65C Dimensions (H x D): approx. 14.5 x 8 cm / 5.71 x 3.15 inch Weight: approx. 107 grams Package includes: 1 heating bag + 1 DC car charger Heated bottle for car charger: when you are driving, if your baby is hungry, you can directly heat the milk with a heater. hot milk via the USB car charger. (Note: Only use the car charger for heating.) Constant temperature: After heating for 15 minutes, the bottle warmer can maintain a constant temperature of 65, allowing the baby to drink water at any time. Multifunctional: can store milk cups, drinking cups or coffee cups. The practical design makes the bag easy to carry when hiking, shopping and traveling. Diameters range from 65mm to 75mm. Handle design: Adjustable handle strap design, convenient for mothers to carry. Made from eco-friendly materials, non-toxic and durable, harmless to your health. It has high wrinkle resistance and shape retention, strength and resilience. Comment: 1 . It can't heat cold liquids to hot, it can only keep your hot liquids hot in your car. 2. Do not use this item when the bottle is empty or when the liquid inside is less than 10% of the container capacity. 3. Do not use more than 30 minutes each time. Note: This car milk warmer cannot be used on a truck and the voltage on the truck is 24 V.