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Batteries not included

New sensor uses movement to power transmission of wireless signals

5:22pm, June 24, 2011

Imagine charging your iPod just by shouting into it, or powering a blood glucose monitor with your pulse. Such technologies aren’t far off: In the latest rendition of tiny, energy-scavenging devices, scientists have developed a prototype sensor that produces enough electrical charge when flexed mechanically to transmit a wireless signal several meters.

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