Charging your batteries via radio — no wires required

Not quite up to Nikola Tesla’s dream of sending electricity long distance through the air, but still a wonderful invention — even better because it’s real and going into production.

Powercast’s platform uses nothing more complex than a radio–and is cheap enough for just about any company to incorporate into a product. A transmitter plugs into the wall, and a dime-size receiver (the real innovation, costing about $5 to make) can be embedded into any low-voltage device. The receiver turns radio waves into DC electricity, recharging the device’s battery at a distance of up to 3 feet.

Link to Powercast’s site.