Stay in control of your hydration with this 500ml Smart Vacuum Insulated Stainless Steel Water Bottle, featuring a cutting-edge waterproof LED temperature display. Simply touch the LED screen to instantly read the temperature of your beverage — no more guessing or risking a burnt tongue! The double-wall vacuum insulation keeps hot liquids above 42°C for up to 6 hours and cold liquids below 10°C for up to 5 hours, making it a reliable companion throughout your day. Crafted with a 304-grade food-grade stainless steel inner wall and a high-quality 204 stainless steel outer casing, this bottle is 100% BPA-free and FDA-approved for safe daily use. The built-in lithium battery is designed for up to 2 years of battery life, with an auto-off screen feature to conserve power. Measuring 6.5 cm x 6.5 cm x 23.3 cm, it is compact enough to carry to the office, gym, school, or on outdoor adventures. Please note: Not microwave safe and not dishwasher safe. Makes for a thoughtful and practical gift for friends and family.