Reliable Long Time Tracking: Continuously tracking and recording blood oxygen saturation level, heart rate and motion every minute, continuous using up to 8-12 hours after fully charged Audio Notification: If your blood oxygen level or pulse rate reading exceeds the threshold you set, both the OxyLink and the ViHealth APP will beep intelligently. App reminders function only when your phone is on the Dashboard screen and unlocked Connect to the APP: Unlimited storage in Vihealth via Bluetooth, with real-time and historical blood oxygen level & heart rate data viewable on the App Dashboard. Data can be saved and downloaded in PDF/CSV format. Sync with Apple Health is supported Comfort-Fit Ring: The OxyLink patented ring sensor is compact, soft and lightweight, designed for superior comfort in continuous monitoring. It features durable construction and a universal fit for most finger sizes OxyLink & ViHealth App Storage: The Oxylink oximeter stores up to 4 records on the device, with each record capturing up to 10 hours of data. Once connected to your phone's Bluetooth, the data will upload to the app automatically. No need to worry about data storage even when your phone isn’t nearby Note: This device is for Sports and Aviation use only and not intended for medical use It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use.