Long-Time Accurate Tracker: OxyU oximeter tracks your blood oxygen saturation level, heart rate and body motion long time, can be used for up to 12-16 hours after fully charged. The lightest, smallest silicone ring sensor makes it comfortable for continuous tracking and durable Detailed APP Records & PC Report: Free to export and share detailed records as PDF, CSV or Binary. View detailed data every four seconds, as well as O2 score. You can manage your oxygen reports through the PC software Smart Notificarion: The device will vibrate and APP beep when your blood oxygen level exceeds the threshold. You can adjust the threshold and intensity of reminders on the APP Built-in Memory: OxyU can store 4 groups of 10-hour data on device. The data will be uploaded automatically when the device is connected to the APP via Bluetooth. (Unlimited store in APP). (The first set of data will be overwritten by the fifth set, so please upload your data to the app promptly) Easy to Use: OxyU blood oxygen saturation monitor runs automatically when you wear it, even the elderly can easily get started.(When placing the oximeter on your finger, ensure that your hand is warm, relaxed, and positioned below the heart level. Maintain stillness and avoid engaging in strenuous activities during the measurement. It is advisable to take a reading before or after exercising.) Product dimensions: Main unit: 5cm x 3cm, Adjustable perimeter: 16-23cm, Probe cable length: ≈22cm. Note: It's not a medical device. 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. Product dimensions: Main unit: 5cm x 3cm, Wristband adjustable perimeter: 16-23cm, Probe cable length: ≈22cm.