Smart wearable technology is evolving into a new form. Powering a smartwatch through solar power could be one the ways but how could it be sustainable under a lengthy cloudy sunless day? Researchers in CUHK recently found that you can be in control of your watch’s energy and sustain its battery endurance through walking and the swinging of your arms.

You get lost on a mountain and your cell phone battery goes flat. How do you get help? You help yourself by walking, wearing a featherweight biomechanical device which harvests energy from the movement of your body. CUHK Professor Wei Hsin Liao explains how a moving knee can generate electricity.