/https://public-media.si-cdn.com/filer/6d/c9/6dc9cffd-6492-4df1-a67c-e881badb5f34/solepower-main-with-hahna-3.png)
One hour of walk time with a pair of EnSoles, designed by Hahna Alexander (inset), provides 2.5 hours of talk time on a smartphone.
(https://www.smithsonianmag.com/innovation/generating-power-one-step-at-a-time-180953436)
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Generating Power One Step At a Time
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