“A Washington, D.C.-based engineer is working on the ‘Drone Shield,’ a small, Wi-Fi-connected device that uses a microphone to detect a drone’s ‘acoustic signatures’ (sound frequency and spectrum) when it’s within range.  The company’s founder, John Franklin, who has been working in aerospace engineering for seven years, says he hopes to start selling the device sometime this year. He is using the Kickstarter-like IndieGoGo to finance the project.  The device will cost $69 and will be about the size of a USB thumb drive.  He says he imagines that people will attach the Drone Shield to their fences or roofs to protect their home from surveillance.”

http://www.usnews.com/news/articles/2013/05/01/tiny-device-will-detect-domestic-drones

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