WATERPROOF LED DISPLAY: Waterproof LED display that can be completely submerged in water. Touch the LED screen to view the liquid temperature. Eliminates the need to test temperature by mouth, helping to prevent burns. KEEP HOT AND COLD LONG TERM: Vacuum-insulated design helps block heat transfer. Retains heat for up to 6 hours above 42°C and keeps liquids cool for up to 5 hours below 10°C, outperforming standard vacuum bottles. Includes a built-in filter to block tea leaves, fruit pieces, ice cubes, and other solids during drinking. SAFE AND HEALTHY MATERIAL: Inner wall constructed from food-grade 304 stainless steel. Outer case made from high-quality 201 stainless steel. Complies with FDA standards for food contact materials. 100% BPA-free. Dimensions: 6.5 cm x 6.5 cm x 23.3 cm. ULTRA CAPACITY BATTERY: Built-in large-capacity lithium battery. Screen automatically powers off when not in use, providing long battery life. WIDE APPLICATIONS: Features advanced double-walled vacuum insulation technology. Stylish and durable design suitable for travel, home, office, or outdoor use. A practical and thoughtful gift choice for friends and family.