【Wearable Design】Comfortable wrist-worn pulse oximeter for continuous blood oxygen monitoring with easy-to-read display screen. 【Record Every Second】Store up to 4 full 12-hour sessions directly on the device. Never miss a reading—even when you’re not connected to the app. 【Vibration & Audio Reminder】The oximeter vibrates and keeps making a "beep" sound if O2 or PR level falls below your preset level. Vibration and sound intensity can be adjusted. 【Long Battery Life】Fully recharge in just 2 hours for up to 100 hours of continuous use. No longer worry about running out of battery. 【Intuitive Report】Graphic report contains Sp02, PR and motion records, free to share through ViHealth app (iOS and Android) and O2insight software (Windows and MacOS) NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use. The Wellue wrist pulse oximeter offers convenient blood oxygen monitoring in a comfortable wearable design. This smart device continuously tracks your blood oxygen levels and pulse rate while you wear it like a watch. It's important to note it's intended for sports and aviation use rather than medical purposes.