Credit to (and read more at): http://www.digitaltrends.com/outdoors/micro-wind-turbine-usb-charger/#ixzz4Y0dOUxlb
To satisfy portability requirements, the Micro Wind Turbine weighs just over 2 pounds, which Ferber claims is 40 percent lighter than its closest competitor, and folds down to the size of an umbrella or trekking pole. Setting up the turbine is also designed to be easy thanks to a telescopic shaft that unfolds the wind-catching blades, also similar to the opening of an umbrella.
Properly set up, the turbine can generate five watts in an 11 mph wind, and can store that energy for later. “The turbine has an integrated 24 Wh battery pack that works as a buffer between [incoming] and outgoing loads and can also store energy for later use,” Ferber detailed to Digital Trends.
Ferber says that there are no other wind turbines of similar scale commercially available. “Comparable concepts are usually composed of many complex parts, are a lot heavier or produce only an insignificantly small output. Unsurprisingly, these mentioned drawbacks render them useless in real-world scenarios.”