Product Description【1】All-Day Accurate Tracker: SleepU oximeter tracks your blood oxygen saturation level, heart rate and body motion all day, can be used for up to 12-16 hours after fully charged. 【2】Comfortable Soft Ring Sensor: The lightest, smallest silicone ring sensor makes it comfortable for continuous tracking, durable and adapt to most fingers. 【3】Smart Reminder: Both the device and APP will let you know immediately when your blood oxygen level exceeds the threshold. You don't need to keep looking at the screen to monitor your o2 levels. Also, you can adjust the threshold and intensity of reminders on the APP. 【4】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, help you understand your body better. Plus, you can manage your oxygen reports through the PC software. 【5】Device or APP Storage: Works independently or together with the app. It stores 4 groups of data on device, each group can up to 10 hours. And the data is automatically synchronized to the APP via Bluetooth.(The first set of data will be overwritten by the fifth set, so please upload your data to the app promptly, unlimited storage on the app) 【6】Easy to Use & Size: OxyU blood oxygen saturation monitor runs automatically when you wear it, even the elderly can easily get started. Product dimensions: Main unit: 5cm x 3cm, Strap circumference: ~27cm, Probe cable length: 17cm. 【7】Note: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use.☀️ 【Package Include】: 1X SleepU wrist pulse oximeter；1X USB cable (Micro)；1X User guide Product SpecificationsBRAND NAME：Wellue COLOUR：Blue MODEL：SleepU WEIGHT：1.09 oz / 31g DEVICE DIMENSIONS：1.6'' x 0.9'' x 0.5'' RING PERIMETER：2.0'' - 3.0'' / 50-76mm WIRELESS：Bluetooth 4.0 BLE BATTERY LIFE：Rechargeable lithium-polymer, 3.7 Vdc, 16 hours for typical use DEGREE OF DUST &WATER RESISTANCE：IP24 RECORDED PARAMETERS：Oxygen levels, pulse rate, motion COMPATIBLE COMPUTER SYSTEM: Windows 7/8/10; macOS 10.15.3 or above COMPATIBLE WITH: iOS 9.0 or above, iPhone 4s/iPad 3 or above; Android 5.0 or above, with Bluetooth 4.0 BLE OXYGEN LEVEL RANGE：70%-99% PULSE RATE RANGE：30 to 250 bpm MEASURE INTERVAL：1S DISPLAY INTERVAL IN APP：4S BUILT-IN MEMORY：4 sessions, up to 10 hours for each session