Jon Phillips:

Yet in its simple, two-trick-pony earphone gadget, LG seems to have delivered on the promise of its product packaging. No, the HeartRate Earphones don’t run apps, or tell the time, or respond to voice commands. But they play music and monitor your heart rate—ostensibly with a high degree of accuracy. And that’s all they need to do.

Sometimes doing one thing, and doing it well, is all it takes.