Description: 【Smart Temperature Display】: Simply touch the top of the bottle cap to check the temperature of your beverage anytime and anywhere, ensuring you enjoy your drink in the most suitable way. 【Double-layer Vacuum Insulation】: Made from stainless steel, this cup provides heat insulation, keeping your liquids at their ideal temperature for a long time. 【 Sealing】: The cup offers great sealing properties that help preserve both hot and cold liquids effectively. 【Product Dimensions】: With a diameter of 6cm and height of 19.5cm, this 420ml cup is compact and portable for go use. 【Stainless Steel Construction】: The stainless steel design ensures longevity and maintains the taste and of your beverage.   Specification: Material: Stainless Steel  Capacity: 420ml Size Chart: 19.5cmx6cm/7.68inchx2.36inch Package Includes: 1x Tumbler Cup(2 Pack) Note: When too high temperature boiling water is put into the cup, high steam pressure will be generated. Please do not flip open the button switch at this time to avoid splashing. If you want to open the cover, please first rotate and unscrew the cover to release the pressure. When not in use, please fasten the lock to avoid burns caused by popup cover.