In green tech news this week, Voltaic unveiled a new waterproof LED touch light that can be powered by any USB source.

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Unlike other pet-tracking devices, which can look like decommissioned Soviet-era spy gear, Tagg's waterproof transmitter is thin, light and styled to match Fido's and Whisker's high-tech lifestyles.

WSJ: Keep Tabs on Fido | Geek Chic