Review on Track Your Fitness Routine with Our IP68 Waterproof Activity Tracker for Men and Women - Heart 💪 Rate, Blood Oxygen, Sleep, Steps, and Calorie Monitoring with 1.14'' HD Screen - Compatible with iPhones and Androids by David Butterfield

I bought this watch because I suspected I had obstructive sleep apnea. I kept waking up with severe dizziness, weakness and shortness of breath. With this watch you can monitor my SPO2, blood flow, heart rate, pulse and HRV all night long. The recorded data clearly showed that I had episodes of apnea several times a night. In fact, hypoxia anxiety woke me up twice; Once it showed that I had an SPO2 of 85-86% within three minutes. I checked the readings with my other devices and they turned out to be accurate. I changed my sleeping habits to avoid sleeping on my back and that definitely helped, but it's good to have an alarm clock as a backup. It takes a bit of work to understand as the information provided is sketchy at best but as it has the potential to save a life who cares.