Fitbit's Charge 4 can wake you up when you feel well-rested - Engadget
- Fitbit's Charge 4 can wake you up when you feel well-rested Engadget
- Three new features land on Fitbit Charge 4 in update Wareable
- Fitbit Charge 4 Adds 'Smart Wake' Alarm, Dynamic GPS PCMag
- The Fitbit Charge 4 is getting some useful new features via a software update TechRadar
- Fitbit updates the Charge 4 to let it wake you when you've slept enough Pocket-lint
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