Garmin vivosmart 4 - midnight black - activity tracker with band - black - 010-01995-10 - Smartwatches - CDW.com
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]
vivosmart HR firmware preparation for in-watch software update - YouTube
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