Wearable wrist O2monitor with soft and comfortable wearable sensor, free your finger from traditional types. Wearable wrist oxygen monitor with soft and comfortable ring sensor, free your finger from traditional types. Recording BO2level, pulse rhythm and motion for fitness and wellness use.Notification function will notify you when your o2level leaves preset zoneFree app and PC software help you to understand your sleep. Graphic sleep report easy to share and print.Rechargeable up to 16 hours for full chg . The device runs automatically when you wear it.