Important Tips for Use 1. Protect the mug lid as much as possible so as not to fall. otherwise it will be easy to break. 2. Wipe or rinse the lid when cleaning. do not soak it in water. Display Temperature Waterproof LED displayStylish mirror. by touching the LED screen. to easily understand the inside temperature of the liquid. This coffee travel mug have waterproof LED display that can be completely submerged in water. You do not have to pass your mouth to test the temperature and avoid burns. The 360 degree turn does not have to worry about water leaks. and the seal is good. Leakproof Coffee Travel Mug Keep Hot Or ColdThis travel mug leakproof is very good. so no warry leakproof when you take it in your bag/backpack or hand hold walking.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). ULTRA-CAPACITY BATTERYThis reusable coffee cup have lithium battery with large capacity. automatic screen when not in use. Can reach 2 years battery life (If the product is damaged within one year. we will replace or refund the product). do not worry about cumbersome battery replacement. Widely Use Great GiftUsing state-of-the-art double-wall vacuum technology. this travel coffee mugs is stylish and full-bodied. Whether you are traveling. at home. in the office or outdoors - the ideal companion. Simple and practical. it is the best Birthday Christmas gift for friends. family. children. sons and daughters.