How smartwatch sensors work, and what changes under the wrist
Optical heart rate does not care which way is up, but it cares a great deal about contact, motion and fit. What the physics says,...
Every watch tells a story. Every strap changes it.
The Smartlet Journal covers watch strap compatibility, modular wearables, and the collector's question that started it all: mechanical watch or smartwatch? Our answer: both.
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