Fitbit's Charge 4 is the company's first tracker with built-in GPS | Mashable
Fitbit Charge 3 & 4: How to Turn Screen Wake On/Off (Turn on from flipping wrist) - YouTube
Fitbit Charge 3 vs Fitbit Charge 4: choose the right fitness tracker for you | TechRadar
Charge 3 gets Smart Wake and other features via a firmware update
Amazon.com: Fitbit Charge 3 Fitness Activity Tracker, Graphite/Black, One Size (S and L Bands Included) : Sports & Outdoors
Fitbit Charge 4 update brings Dynamic GPS and Smart Wake Alarms
Fitbit Charge 4 major update adds Dynamic GPS, Smart Wake alarms - PhoneArena
Fitbit Enhances Smartwatch Experience with OS Update, Debuts Best Heart Rate Tracking Yet for Versa 2, and Delivers Expanded Premium Features | Business Wire
Solved: New smart sleep alarm app - Fitbit Community
Fitbit's Charge 4 can wake you up when you feel well-rested | Engadget