Vi AI Personal Trainer review: Heart rate-tracking Bluetooth earbuds with serious potential

Macworld
Apr 17, 2017, 8:00 am313 pts
It seems like every new fitness band on the market has a built-in heart-rate sensor, but now headphone companies are baking sensors into their devices, too. The ear has become a popular place to put a sensor, because properly fitting earphones will stay put and presumably measure your heart rate more…

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