The luminous cup can emit light for about three years, with good insulation effect, and it is more durable if it is used normally.
A thermos cup is generally a water container and a vacuum layer made of ceramics or stainless steel. The top of the thermos cup is covered and sealed tightly. Vacuum insulation layer can delay the heat dissipation of water and other liquids in it, thus achieving the purpose of insulation. The thermos cup is developed from the thermos bottle, and the heat preservation principle is the same as that of the thermos bottle, except that people make the bottle into a cup for convenience.