A smart ring is a stylish and wearable electronic product that can be connected to a smartphone via Near Field Communication (NFC) to perform function execution and data sharing. Designed with high water level waterproof function, it can be used without any power supply. Embedded NFC chip can only be connected to NFC-enabled smartphones. Detailed operation: Place the smart ring in the NFC area of the smartphone to perform: screen unlock, application lock unlock, fast application launch, business card and URL information sending and reading, etc. Instructions for use: 1. First, check if your smartphone has NFC function. It can usually be found in the system settings. If you don't find the relevant option, contact the manufacturer's after-sales support, or if your smartphone model has NFC capabilities, search and confirm its NFC area on Google. 2. If your smartphone has NFC function, turn on the NFC switch, search for NFC-enabled software in the app store, download and install them. 3. Launch the NFC APP and follow the instructions. 4. Because NFC is a near field communication technology, when reading any data, please make sure to place the top of the ring chip near the NFC area to avoid reading and writing failures.