SpO2 (blood oxygen) tracking. Irregular heart rhythm notifications. ECG app - assess heart rhythm. Heart Rate info - resting HR high and low rates etc. Stress notifications. Stress Management Score. Tracks sleep quality and sleep stages. Sleep Score - learn about previous night's sleep. Skin temperature sensor. Active Zone Minutes. Built-in GPS. Steps distance and calories tracking. Swimproof up to 50 M. Alexa built-in. Battery life of 6+ days. Small band fits wrists 5.5" to 7.1" in circumference. Large band fits wrists 7.1" to 8.7" in circumference.
