How does HealthSense 4 — the new ScanWatch 2 OS — compare to HealthSense 3? Swipe left to find out. Learn more via the link in bio. #ScanWatch2 #RestoreYouNights #SuperchargeYourDays — ScanWatch 2 incorporates the medical device software Withings ECG App. Withings ECG App enables the detection of atrial fibrillation through ECG readings. The ECG functionality has been cleared by the FDA. Please read the user instructions carefully. If you have any concerns about your results, consult your doctor.