NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use. RECHARGEABLE: The device runs automatically when you wear it, up to 16 hours for a full charge. UNLIMITED STORAGE IN APP: When the device is connected to the APP via Bluetooth, the data will be uploaded automatically. The built-in memory can store 4 groups of 10 hours of data on device. UNUSUAL DATA MARKING: If the SpO2 level is lower than the preset threshold and heart rate is lower or higher than the preset threshold, the device will tell you and mark it in the report. DETAILED APP & PC REPORT: Free APP & PC software provides graphic report and trends of data, reviewing real-time data in APP dashboard. Unlimited sharing of PDF and CSV reports. COMFORTABLE SOFT RING SENSOR: The lightest, smallest ring sensor for continuous tracking, durable and adapt to most fingers.

Battery Description: Lithium-Ion. Sensor Type: Wearable. Battery Life: 16 Hours. Screen Size: 0.96 Inches. Compatible Devices: Smartphones, Desktops. Brand: Wellue. Date First Available: September 3, 2020. Best Sellers Rank: #52,989 in Health & Household. Customer Reviews: 4.2 out of 5 stars 1,294 ratings 4.2 out of 5 stars. : B08HDGBF7P. Brand Name: ?Wellue. Package Weight: ?0.12 Kilograms. Item Package Dimensions L x W x H: ?4.21 x 3.82 x 2.76 inches.