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Testbericht: Fitbit Flex - Aktivitätstracker nach meinem Geschmack
Fitbit Flex 2 review: A low-key, wear-anytime tracker that's swim-proof (at last!) - CNET
Fitbit Flex 2 review: Tech Advisor
Fitbit Flex Review - SlashGear
Fitbit Flex Review: Tracking Your Activity for a Comprehensive Fitness Picture - ITS Tactical
