From Ars Technica : http://arstechnica.com/gadgets/2013/07/hands-on-with-the-leap-motion-controller-cool-but-frustrating-as-hell/

“I’ve spent about two days with the Leap Motion Controller, a Kinect-like PC accessory that uses infrared sensors to translate the motions of your hands into input for applications. The device I received is one I pre-ordered more than a year ago; I’ve been anxiously awaiting its arrival ever since I saw the first video of the device in action.

The Leap costs $79.99, and for your money you get a tiny little aluminum rectangle. It fits easily in the palm of my hand, and once situated on the desk it’s essentially invisible. There are precisely two external features: the green power LED and its USB port.”