The validity of activity trackers is affected by walking speed: the criterion validity of Garmin Vivosmart® HR and StepWatch™ 3 for measuring steps at various walking speeds under controlled conditions [PeerJ]
User manual Garmin vívosmart HR (English - 16 pages)
vívosmart HR - Associazione allo smartphone [TUTORIAL] - YouTube
vívoactive HR | Discontinued | Garmin Malaysia
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User manual Garmin Vivosmart 3 HR (English - 16 pages)