These $250 Bluetooth earphones pack in a heart rate sensor, voice-coaching, and gorgeous Harman/Kardon sound in one lightweight package. But they’re hindered by an ultra-narrow focus on one type of exercise.
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 accurately than a wrist-worn sensor prone to moving around during exercise. That’s why companies like Samsung, JBL, Jabra, and Bose are shipping biosensing Bluetooth earphones designed for workouts.
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https://www.techhive.com/article/3188898/headphones/vi-ai-personal-trainer-review-heart-rate-tracking-bluetooth-earbuds-with-serious-potential.html
