WATERPROOF LED DISPLAY: Waterproof LED display that can be completely submerged in water. Just touch the LED screen and the liquid temperature will show on the LED screen. It is not necessary to test the temperature with your mouth or you risk burning yourself. KEEP HOT AND COLD LONG TERM: Vacuum cups and mugs can block heat transfer. Our products retain liquid heat for up to 6 hours above 42C and liquid cooling for up to 5 hours below 10C. That's longer than other vacuum bottles. A filter is also included which can block tea, fruit, ice cubes, etc. while drinking. SR AND HEALTHY MATERIAL: The inner wall is food grade 304 stainless steel and the outer case is high quality 201 stainless steel. It has been approved by the FDA for your drinking needs. Of course, 100% BPA free. (Cut: 6.5cm*6.5cm*23.3cm) ULTRA CAPACITY BATTERY: Large capacity lithium battery, the screen will automatically turn off when not in use, and can last for 2 years. You don't have to worry about the problem of changing batteries every day. WIDE APPLICATIONS: Using advanced double-walled vacuum technology, this mug is stylish and durable. Whether you're on the go, at home, in the office or outdoors - the perfect companion. Simple and practical, it is the best Christmas gift for friends, family.