Fitbit Flex review: A most versatile, feature-packed tracker - CNET

Boasting sleep-tracking, step-recording, and calorie-counting abilities in a comfortable wrist strap, the $99.95 Fitbit Flex is one impressive personal fitness tracker.

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Fitbit Flex review - The Verge

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Best Fitbit fitness trackers and watches in 2024 - The Verge

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