Market place Features: Smart Chip, No Need To Charge, No Need To Replace The Battery With HD LCD touch screen for prompt real-time water temperature display. Let drink the water that is most suitable for temperature anytime, anywhere. Made of 304 stainless steel, double layer vacuum design, safe, BPA-free and eco-friendly, no smell and easy to clean. It can keep hot or cold water for 12 hours. The capacity of this smart mug is 420ml/14oz, and it is portable and durable. Ideal for travel, outdoor activities, car, office, home, school, picnic, hot yoga, hiking, camping etc. This vacuum flask water bottle is also a good container for coffee, Juicer, milk, drinks and daily hydration. Best Gift for family and friends.