WATERPROOF LED DISPLAY : 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 burnDURABLE KEEP HEAT COLD: 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)SAFE&HEALTHY MATERIAL: The inner wall 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. (Size: 6.5 cm * 6.5 cm * 23.3 cm)ULTRA CAPACITY BATTERY: Lithium battery with large capacity, screen turn off automatically when not in use can reach a battery life of 2 years. Dont need to worry about battery rechange issue daily.WIDE APPLICATIONS: With the state-of-the-art double-wall vacuum technology, this mug is stylish and durable. Whether you are traveling, at home, in the office or outdoor - the ideal companion. Simple and practical, it is the best Christmas gift for friends, family.