ScanWatch 2 isn't just a snazzy smartwatch with health tracking - it's a medical-grade electrocardiogram. Its upgraded PPG heart rate sensor makes this even more accurate than the original. It can reliably detect potentially serious heart rate irregularities, including atrial fibrillation. And you can relax because you'll be notified in real-time, 24-7. And you'll sleep soundly too, with clinically validated SpO2 keeping a watchful eye. Throughout the night, sensors monitor your breathing for disturbances that could indicate apneic episodes. And then you'll wake up to a sleep score. Withing's latest trick is day and night temp tracking. Any big changes in body temperature and you'll know about it. That can help guide your workout recoveries or give you a heads-up if you're getting rundown by an illness.Good to know- Your partner will appreciate the Smart Wake Up system - it picks the optimal moment in your sleep cycle to wake you up, silently- With activity tracking for just about everything, you can watch your fitness progress however you get your kicks- Its classic analogue clock and brass dial is paired with a steel rotary wheel that toggles through your health stats- The secondary OLED screen displays live health stats and works great in bright sunlight- Feel free to take it to the deep end of the pool - it's swimproof to 50 m- Simply pair ScanWatch to your phone and connected GPS lets you track distance, pace and elevation on runs- No more excuses for missed calls when all your smartphone notifications go straight to the watch- Wear it as a traditional watch and the battery will last you up to 30 days- Sapphire glass means the display is extra resistant to scratches and scuffs______________Please note: ScanWatch has received CE medical certification in Europe and FDA clearance in the United States. You should not use ScanWatch if you wear a pacemaker or other internal medical device.