【72hrs Battery Life】Up to 72 hours of use after being fully charged to track your O2 value and PR day and night.【Smart Reminder】The adjustable threshold buzzer and vibration in the device will remind you when the O2 levels or pulse rate exceeds the threshold your preset.【Work Stand-alone】 Keep the latest 4 sets of 10 hours data in the device and automatically sync and store in the APP, once them connected.【Comfortable Sensor】Comfortable wearing with the soft wrist monitor and patented ring sensor avoid falling off and won't make your finger numb. Suitable for all day wear.NOTE: It's not a medical device. This device is for Sports and Aviation use only and not intended for medical use.