Fitbit Charge 4 review: Built-in GPS and better sleep tracking, plus it's pretty - CNET

Fitbit Charge 4 review: Built-in GPS and better sleep tracking, plus it's pretty     - CNET
Fitbit's new Charge 4 looks a lot like the Charge 3, but it has stepped up its fitness game with onboard GPS and better activity tracking. Here's everything you need to know.