WATERPROOF LED DISPLAY: Waterproof LED display that can be completely submerged in water. Simply touch the LED screen and the temperature of the liquid will show on the LED screen. You don't have to test the temperature with your mouth or get burned. DURABLE KEEP HEAT COOL: Vacuum cups and mugs can block heat transfer. Our products retain liquid heat above 42C for up to 6 hours and liquid cooling below 10C for up to 5 hours. It's longer than other children's insulated water bottles. (After 24 hours in 100C water, the temperature is maintained at around 40C) SAFE AND HEALTHY MATERIAL: The insulated water bottle is made of 304 food grade stainless steel. It has been approved by the FDA for your drinking needs. Of course, 100% BPA free. (Size: 7.6*13.8CM), take this child water bottle easy to carry ULTRA CAPACITY BATTERY: large capacity lithium battery, the screen will automatically turn off when not not used can reach a battery life of 2 years. Don't worry about the battery replacement problem daily. WIDE APPLICATIONS: Thanks to cutting-edge double-walled suction technology, this kids' insulated water bottle is stylish and durable. Whether travelling, at home, in the office or outdoors - the perfect companion. Simple and practical, it is the best Christmas gift for friends, family.