Smart LED Flask / Water Bottle You Should Drink With Style, We designed this bottle with vacuum insulated and smart chip technology. Enjoy your refreshing coffee with a double volt stainless steel insulated flask on a cold winter day. Made from 100% food-grade stainless steel, this flask is durable and rust-free. The double-walled insulation system ensures minimal heat loss and maintains temperatures for up to 3-4 hours and cold drinks for 8 hours. In addition, it also prevents the formation of sweat or droplets on the body of the flask. The double-walled stainless steel insulated flask has a BPA-free plastic lid with a steel exterior. The spun matte finish adds elegance to this flask. With a contemporary design with a wide body and slim mouth, you can easily clean and maintain this flask. This strong flask has a capacity of 500 ml and allows you to have both hot and cold drinks when you are out.