Model: Atongm NFC Smart Ring G1; Color: Black + Silver; Size XS (inner diameter: 17mm, perimeter 53.38mm); Specification: You can use your NFC Ring to share Wi-Fi information, links to websites, contact information or whatever you think is suitable to be passed securely to your friends, smartphones and tablets; Your NFC Ring can also be used to start APPs with custom settings (parameters), making it a really easy way to personalize the app experience to match your ring; The APP of R1.0 version is currently offered, and it has two basic functions: Personal card: You can write your own name, phone number, E-Mail, and other basic information into the part with card icon of G1 ring via the APP; After that, you can touch the NFC-enabled smartphones with the ring and transmit your contact information toothers easily; Program Lock: You can use the App to bind the ring and the phone, and then you can lock the programs that contain privacy information, such as QQ, micro-message, and Evernote; The locked programs can be instantaneously unlocked via touching the G1 ring with the phone. So, you don't have to remember complex unlocking passwords or graphics. Others can't open the locked programs without your unique G1 smart ring. The APP of R2.0 version will include the following two functions: Password wizard: After the authentication of G1 smart ring, you can bring up the password wizard interface via touching the phone with the ring, and then directly view, select, and copy the information on the pop-up interface. It is more convenient and secure than traditional password book. Privacy information: If you get some private messages, pictures or videos that you dont want others to see, you can use G1 smart ring to encrypt them. When you want to view them, you can unlock them via touching the phone. Others cant see them without your unique G1 ring. In the APP of R3.0 version, we will try to add simple interactive games as well as personal cloud service function to G1, continuously enriching its functions. Size: 55x55x43mm. Note: Please make sure your phone has NFC function and the size of your finger before Place order. Applicable Phone Models: SAMSUNG Galaxy Nexus, Galaxy S3, Galaxy S3 Mini, Galaxy S4, Google Nexus S, Galaxy Note 2, MOTOROLA Moto X, Droid Maxx, Droid Razr M, Droid Razr HD HTC One, First, One X LG Google Nexus 4, Optimus 4x HD, Optimus L5, Optimus L7 Sony Xperia Z, Xperia T, Xperia P, Xperia S other Mi 2A, Mi3, OPPO Find5, GEAK Eye, GEAK Mars, and the mobile phones with NFC function.