Activity trackers don't usually generate a lot of buzz or attract much attention from professional leakers like Roland Quandt prior to their official announcements, but the unreleased Fitbit Charge 4 is not your everyday low-cost smart band.
Set to follow in the footsteps of one of the world's most popular wearable devices... at some point in the near future, this bad boy had and now we know what the main selling point will probably be.
If you're familiar with the Fitbit Charge lineup, you should be well aware the most important feature missing ...
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