This listing is for the size 9 variant of this product. Your parcel will also be fully insured and trackable1. R4 is entirely made of micro-crystal zr ceramics, calmly deal with all kinds of scratches.2. R4 carries with multiple sets of rfid chip modules, capable of simulating 4 contactless rfid cards.ic card1id card1nfc card1nfc card13. R4 is capable of operating different functions or sharing different information on android and ios platforms through two sets of nfc modules, e.g. Virtual call quickly trigger a real timed call scene notification quickly trigger multiple present notifications, memo sharing, business card sharingspecificationsbrand name jakcomlanguage englishapplication age group adultfunction call reminderfunction remote controlfunction nfcfunction1 idfunction2 m1compatibility ios, androidyou will receive1 x smart ring