WATERPROOF LED DISPLAY: waterproof LED screen that can be completely submerged in water. Just touch the LED display and the liquid temperature will be displayed on the LED display. It is not necessary to test the temperature with your mouth or you may burn yourself. (If the product is dyed within one year. Please contact us as soon as possible) KEEP WARM AND COLD LONG TERM: Vacuum from cups and mugs can block heat transfer. Our products retain liquid heat for up to 6 hours above 42 C and liquid cooling for up to 5 hours below 10 C. This is longer than other vacuum bottles. A filter is also included which can block tea. the fruits. ice cubes. etc. while drinking. SR AND HEALTHY MATRIAL: The inner wall is food grade 304 stainless steel and the outer casing is high grade 201 stainless steel. It has been approved by the FDA for your alcohol consumption needs. Of course. 100% does not contain BPA. (Cut: 6.5 cm * 6.5 cm * 23.3 cm) ULTRA CAPACITY BATTERY: Large capacity lithium battery. the screen turns off automatically when not in use and can last up to 2 years. You don't have to worry about the problem of changing batteries every day. WIDE APPLICATIONS: Thanks to advanced double-wall vacuum technology. this mug is stylish and durable. Whether you are on the move. the House. in the office or outdoors - the perfect companion. Simple and practical. it is the best Christmas gift for friends. the family.