The small device measures heart rate, level of oxygen in your blood, pulse and body temperature to work with a smartphone and actually diagnose more than a dozen health issues. (gigaom.com)
Considering that step counts are such an important aspect of how these apps and devices measure physical activity, which includes calories burned or calculating distance, their accuracy is crucial. (ahealthblog.com)
The entire device measures in at 7.6 mm, and weighs in at 6.4 ounces. (slashgear.com)