Using WiFi signals to charge your gadgets

I really like this device from RCA.  It taps WiFi signals and converts the signal to electricity.

The claim is, using only WiFi signals at CES, it was able to charge a BlackBerry from 30% to full in about 90 minutes.  The Airnergy Charger has a battery, so it can suck up power while you are getting your caffeine fix at Starbucks and use to charge your gadget later on.  RCA says that the Airnergy Charger will be available this summer for a mere $40, which is about half  the cost of the Mophie Charger I’m currently using.

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