Garmin unveils Vivosmart 4 activity tracker with advanced sleep tracking via a pulse oxygen sensor, available now starting at $129 (Mariella Moon/Engadget)

Mariella Moon / Engadget:
Garmin unveils Vivosmart 4 activity tracker with advanced sleep tracking via a pulse oxygen sensor, available now starting at $129  —  Garmin has launched the latest version of Vivosmart, and based on its features, the wearable is meant to be a direct competitor to Fitbit's Charge 3.

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