The smart water bottle has a LED display,water leak proof,it's low energy consumption and without a battery change,That can use several years! Press the top of the thermos softly,Sensitive capacity touch-cover can show the temperature of water inside the thermos immediately that can avoid the embarrassment of burning your.The inner wall is made of 304 grade food grade stainless steel and the outer case is made of high quality 304 stainless steel.They also have the silicone bottom which is designed to prevent them from sliding and spilling. Other parts of these Travel mugs are made of BPA-free PP materials ,food grade contact silica gels and 100% Co-polyester plastic that make them Safe and Healthy to use.