specification: material: metal Size: about 4 * 5 * 0.5cm / 1.57 * 1.97 * 0.2 inches Product name: NFC multifunctional smart ring Dimensions: 6/7/8/9/10/11/12/13 inches packing list: 1 * Smart Ring 1 * Instructions for use of the manual: 1. First, check if your smartphone has NFC function. It can usually be found in the system settings. 2. If your smartphone has NFC function, please turn on the NFC switch, search for NFC software in your application, and then download and install them. 3. Start the NFC APP and follow the instructions. 4. Since NFC is a near-field communication technology, when reading any data, make sure to place the top surface of the ring chip near the NFC area to avoid read and write failure.
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