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]
Garmin Vivosmart HR Review | PCMag
Garmin vivosmart® HR (Imperial purple - regular fit) Water-resistant activity tracker with built-in heart rate monitor at Crutchfield
Garmin * LEAK * New Product - Vivosmart HR and **GPS**
User manual Garmin vívosmart HR large (English - 8 pages)