...AND CHEAPER...:

 A US startup has devised a shoe insert that can transform energy generated from walking into usable energy to power portable devices, including mobile phones, GPS devices, and fitness trackers. [...]

While this could certainly be convenient for mobile phone users who burn through their batteries throughout the day, wearers of fitness trackers might also enjoy a fringe benefit to all that moving about.

The company adds: "A business person might use SolePower walking a trade show floor, a hiker would find SolePower very useful for charging cameras or GPS on long hikes, anyone in a natural disaster (i.e., hurricane Sandy) could use SolePower for emergencies."

Another company offering a similar device is watchmaker Seiko, which offers a self-charging watch called Kinetic, reports Mobihealthnews.

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