Electrocardiogram — Detect atrial fibrillation or normal heart rhythm monitor low and high heart rate in just 30 seconds via ECG Wrist-based oximetry — Provides on demand medical-grade oxygen saturation level (SpO2) in just 30 seconds Heart scanning — Check heart beat and receive notifications when heart rate is atypical (low or high) and if irregular rhythms are detected Heart rate tracking — Track heart rate continuously during workouts to optimize training and monitor daily and overnight heart rate to help improve health over time Breathing disturbances detection — Detect breathing issues during the night and identify signs of sleep apnea Scanwatch Accessory