3D brazing technology 360° high temperature heating. Vacuum copper core liner, tailless vacuum technology. Insulation and cold preservation, 700ml above 39°C (24 hours). Using 204 austenitic stainless steel, high standard healthy liner. Competitive design, more portable with rice, small capacity about 500g ≈ the weight of a bottle of water. It can be used as a food supplement/keep warm/boil porridge, etc. It can be used anytime, anywhere. Capacity: 700ml