Specific operation: the smart ring can unlock the screen by touching the NFC signal area of the mobile phone; lock the application program; quickly start the application; send and read the business card, website information and other functions. Instructions: (1) First of all, please check whether the mobile phone has NFC function. Generally, the NFC switch of the mobile phone is in the system settings of the mobile phone. If the user does not find the NFC function and other options of the mobile phone, please contact the after-sales service of the mobile phone manufacturer or Baidu to search whether the corresponding mobile phone model has NFC function, and confirm the NFC signal area of the mobile phone. (2) If the mobile phone has NFC function, after turning on the NFC switch, search the software about NFC function in the application software market, download and install it, and operate according to the instructions above. (3) Open the downloaded NFC software and follow the instructions above. (4) Since NFC belongs to near-field communication, when reading any task, please make sure that the ring chip position is directly facing and close to the NFC signal area of the mobile phone, otherwise, the normal reading and writing may be impossible. Size of the ring Specifications: For Android system, please download NFC Tools 4.0 Chinese version from Baidu. Ring material: 316L (titanium steel) Ring specification: single weight about 11g Package Included: 1*ring