Matrix is back at CES this year with the PowerWatch 2, a follow-up to last year’s wearable that was powered entirely by the body heat emitted from your wrist. For the second iteration, Matrix has made a surprising amount of progress, because the PowerWatch 2 has evolved from a black-and-white screen to a 1.2-inch color display, with support for thermometric and solar charging, as well as with GPS and fitness tracking. The main attraction remains the same: this is a watch that never needs to be plugged in to charge.
Still, despite such a headlining feature, this isn’t supposed to compete with your Apple Watch. You can’t download third-party apps, it has very limited notification support, and it can’t place calls. The company says that the...