Zojirushi SM-KHE36/48 is a stainless steel mug designed for holding beverages and keeping them hot or cold. It features a vacuum insulation that prevents the outside of the mug from becoming hot or cold, while the contents remain at their original temperature for many hours. The mug has a 1/2-inch space at the top to prevent overflow when filling. It also has a safety lock to prevent accidental opening, a button to open the lid cover, and a stopper to prevent spills when drinking. The mug is not suitable for use in a microwave or for heating in a microwave.