This year’s Consumer Electronics Show is over, but there are still a number of nifty devices trickling into our inboxes. One of our favorites is the RCA Airnergy, a USB-connected device that converts Wi-Fi antenna signals into usable power for your gadgets. The device is completely self-sustaining — it automatically charges whenever a Wi-Fi signal is close by and stores the power in a lithium-ion battery.

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The Airnergy’s recharging time depends on the quality and number of Wi-Fi signals nearby, but an RCA spokesman at CES said that it was possible to fully charge a Blackberry at 30% power in just 90 minutes using ambient signals.

RCA’s technology isn’t new, but this is the first time it has been used in a commercial device. The Airnergy is relatively cheap, too, with an expected price of $40 when it goes on sale later this year. We love the idea — while it may not be practical for emergency charging in the woods, the Airnergy could be invaluable in on-the-go situations when your cell phone‘s power is petering out.

Via Popular Science