Smart Ring,COOSO R3F Newest Magic Smart Ring Universal For All Android Windows NFC Cellphone Mobile Phones.White,Size 11(one year free warranty) You will get one white Ring . High Water Resistant and No charging required.Unlock phone ,Quick start phone's program,Share informations,Private notebook,etc Substitute "Door Key" ,"Payment Card" ,"Parking Card","Elevator Card"other"IC"/"ID"card Made by Liquid Tungsten and Epoxy Crystal Ceramic ,Fashionable design elements.Resistance portion of the electromagnetic,protection of human health. Support most Android&Windows NFC Mobiles. Size Chart please check the image