This is the popular Combi "Jokinjozu α," which easily sterilizes baby bottles in the microwave. After sterilization, it can be used as a storage case, making it hygienic and very convenient. This is one of two I own, purchased for when I went back to my hometown. Used for only two months, and comes with the instruction manual. Easy sterilization, just microwave it without using any sterilizing solution. Space-saving and economical, it's recommended for families with babies!