WATERPROOF LCD DISPLAY: waterproof LCD screen that can be completely submerged in water. Elegant mirror. easy to understand the internal temperature of the liquid by touching the LCD screen. The 360 degree rotation does not have to worry about water leaks and the seal is good. LONG LASTING KEEP WARMTH AND COLD: The vacuum of cups and mugs can block the transfer of heat. Our products can keep the heat of the liquid above 42 C for up to 6 hours and the cooling of the liquid below 10 C for up to 5 hours. which is longer than other vacuum bottles. (After 24 hours. 100 C of water. the temperature is maintained around 40 C) SAFE. HEALTHY AND PORTABLE: The liner of the 500ML premium empty bottle is made of food grade 304 stainless steel, and the outer shell is of high grade 204 stainless steel. Hard. corrosion resistant. safe and healthy. It has been approved by the FDA to meet all of your alcohol consumption needs. 100% does not contain BPA. ULTRA CAPACITY BATTERY: Large capacity lithium battery. automatic screen when not in use. Battery life lasts up to 2 years (If the product is damaged within one year. we will replace or refund). don't worry about tedious battery replacement. APPLICATIONS: Using state-of-the-art double wall vacuum technology. this mug is both elegant and substantial. Whether you are on the move. the House. in the office or outdoors. it is the ideal companion. Simple and practical. it is the best holiday gift for friends. family. children. sons and daughters.