BUILT-IN NFC CHIP: Smart wearable ring built-in NFC chip, can replace access control, elevator cards, shopping cards, bus subway cards and various non-contact IC, ID chip. Which is close to the phone, can be queried or Recharged, and so on;    INTELLIGENT RING: The smart magic ring is a wearable gadgets components, a touching the phone NFC signal area with the enchanted ring, to achieve the screen to unlock, application lock, quick start application, URL information sharing and other functions. How powerful the software Is how intelligent your rings will be;    SHARE: u0026 TRANSFER INFORMATION: Send the private message / Picture / Business card / WIFI password / URL information sharing / Website link to the person you want to share by a simple touch;    CONTROL APPLICATIONS: You can lock and unlock your smartphone or tablet quickly, write a fixed process list ahead of the time, and the ring will start or hide the applications each time at your will by simply touch. Let the ring become your shortcut key For a private opening;    BEST CHOICE: Made of high-quality germanium with high sensitivity, waterproof u0026 no charging required, support all Android and Windows phones with NFC function. ( Size chart please check the image). If you have a problem with the item, please contact us, we Will do our best to resolve the problem for you