TEMPERATURE DISPLAY This thermosteel water bottle shows the accurate temperature display of the liquid inside it. 304 STAINLESS STEEL The inner wall is made of 304 grade food grade stainless steel and the outer case is made of high quality 204 stainless steel. SMART THERMAL FLASK With the state-of-the-art double-wall vacuum technology, this mug is stylish and durable. Whether you are travelling, at home, in the office, or outdoor – the ideal companion. Simple and practical. WATERPROOF BODY Waterproof LED display that can be completely submerged in water. Just touch the LED screen and the temperature of the liquid will show on the LED screen. You do not have to test the temperature with your mouth or risk to get burn. SAFE TO USE The vacuum of cups and cups can block heat transfer. Our products hold liquid heat above 42 ° C for up to 6 hours and liquid cooling below 10 ° C for up to 5 hours. This is longer than other vacuum bottles. (After 24 hours at 100 ° C water, the temperature is maintained at about 40 ° C). The inner wall is made of 304 grade food grade stainless steel and the outer case is made of high quality 204 stainless steel. Leak Proof Design The travel mug is sealed and spill-proof to ensure perfect, safe sealing and reliable, leak-free performance. Therefore, after locking, you can place it anywhere. Avoid accidentally opening in the package KEEPS HOT / COLD: The vacuum of thermos flask's cup blocks heat transfer. The products hold liquid heat above 42 °C for up to 6 hours and liquid cooling below 10 °C for up to 5 hours. This is longer than other vacuum bottles. (After 24 hours at 100 °C water, the temperature is maintained at about 40 °C). The inner wall of the small flask is made of 304 grade food grade stainless steel and the outer case is made of high quality 204 stainless steel. It has been approved by the FDA for your drinking needs. Of course, 100% does not contain BPA.