Display Temperature & Waterproof LED displayStylish mirror, by touching the LED screen, to easily know the inside temperature of the travel mug lid. Tips:1.The mug lids have protective plastic film on the surface , REMOVE IT. protect the travel mug lid and not to fall, it is easy broken. 2. when cleaning the lid, NOT SOAK IT IN WATER .each pressed the mug lid , the temperature is displayed for 3-4 seconds, and then inter the invisible power saving mode. Next touch will display again. 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. If the mug lid does not work, please contact us immediately through your order. We will replace the new cap for you for free. Please give us the opportunity to slove your problem and make your shopping h 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). Stainless Steel Coffe Cup Safe/ Healthy/ PortableThe coffee travel mug leakproof 500 ml high performance vacuum bottle is made of 304 grade food grade stainless steel and the outer casing is made of high quality 201 stainless steel. Tough, corrosion resistant, safe and healthy. 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) 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.