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This application is not a medical device. The data obtained when using this application is for informational purposes only and should not be used for cical diagnosis, medical research, diagnostic or therapeutic purposes. How do smart rings connect to devices? Download the app "Qring" on your phone and use it over a wireless connection. What systems are smart rings compatible with? The Smart Ring is compatible with phones with Android 5.1 or later and iOS 8.0 or later. Smart ring can't be used? Please charge it first. It may be out of power. Is the ring monitoring data inaccurate? 1. Please make sure that the smart ring is connected to the mobile APP "QRing". 2. Please select the appropriate size. If it's too tight, circulation in the fingers will be poor. If it's too loose, the ring will easily come off. 3. Keep the phone and ring close to each other while measuring.