The wearable is the company's most advanced yet, offering standard fitness and sleep tracking, along with optical heart rate monitoring, GPS, and standalone music functionality. (pocket-lint.com)
It has all the usual activity and sleep tracking features, along with optical heart rate monitoring, built - in GPS and standalone music functionality. (pocket-lint.com)
On the watch's bottom, there's a small optical heart rate sensor sitting in the middle. (techradar.com)