It still has all the great features the first-gen Sense offered, like built-in GPS for hikes, biking and driving.
You can also see your nightly blood oxygen levels at a glance. Besides keeping a close eye on atrial fibrillation (heart rate irregularities), this Fitbit includes a cEDA sensor that detects electrodermal activity, which often correlates to your body's response to stress. This is the second generation of Fitbit's health-focused smartwatch, and the updated interface return of the physical navigation button make this wearable particularly appealing - especially at this price. With tools to monitor heart health, stress management and even skin temperature, this is a bit like having a medical assistant around your wrist at all times.
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