Product details of 500ml Thermos Stainless steel tumbler insulated water bottle cute coffee thermos cup LED Touch Display Temperature Vacuum Flasks Drinkware smart hot water bottle travel mug with extra battery gift

• Specifications:Material: 304 inside and 201 outsideScreen: LEDColour: BlackCapacity: 500mlType: Thermos CupNOTE: IF ITS RUNS OUT OF BATTERY, PLEASE CHANGE THE BATTERY.here is battery change process link : https://www.youtube.com/watch?v=ZpBrD4bZSp0Features:1. Insulation: The double vacuum reflects internal heat, and the vacuum insulation layer can block thermal convection. And conduction can delay the heat dissipation of the liquid contained in the inside