They're activity trackers. You start them to your wrist/pants and turn it on. Then it tracks the steps you've taken, calories burned, stairs climbed, your sleep pattern. Some even have hearth rate monitoring.
The point is that it's active 24/7 not just during workouts. These gadgets are part of the quantifiable self movement.
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The conclusion being: I have no idea what those are and when would use them instead of your phone.
They're activity trackers. You start them to your wrist/pants and turn it on. Then it tracks the steps you've taken, calories burned, stairs climbed, your sleep pattern. Some even have hearth rate monitoring. The point is that it's active 24/7 not just during workouts. These gadgets are part of the quantifiable self movement.