If you don't need GPS, the Fitbit Charge 3 is still the best fitness tracker for the money | Android Central
Fitbit Charge 4 Fitness Tracker with Step Counter, Heart Rate Monitor and Gps Enabled in the Fitness Trackers department at Lowes.com
Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep and Swim Tracking, Black, One Size (Small and Large Bands Included) - Walmart.com
First Look: Fitbit Charge 3 Activity Tracker with SpO2 Sensor & Sleep Disturbance Tracking | DC Rainmaker
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Fitbit Charge 3 hands-on: Better controls come with a trade-off
Fitbit Charge 3 specs leaked ahead of official announcement - PhoneArena
Fitbit Charge 4 with built-in GPS - YouTube
Fitbit Charge 4 with GPS In-Depth Review | DC Rainmaker