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 business card, website information, and other functions. Instructions: (1) First, check whether the mobile phone has an NFC function. Generally, the NFC switch of the mobile phone is located in the system settings. If the user cannot find the NFC function or related options, please contact the phone manufacturer's customer service or search online to confirm if the specific phone model supports NFC and locate the NFC signal area. (2) If the mobile phone supports NFC, after enabling the NFC function, search for NFC-related software in the app store, download and install it, then follow the instructions provided. (3) Open the downloaded NFC software and follow the on-screen instructions. (4) Since NFC is a near-field communication technology, when reading or writing data, ensure that the ring's chip is directly facing and close to the NFC signal area of the mobile phone to allow normal operation. Ring Specifications: Compatible with Android systems, please download NFC Tools 4.0 from your preferred source. Ring material: 316L stainless steel. Ring weight: approximately 11g per piece. Package Included: 1 x ring.