The Leap is a small iPod sized USB peripheral that creates a 3D interactive space of 8 cubic feet to precisely interact with and control software on your laptop or desktop computer.

Say goodbye to your mouse and keyboard.

Leap represents an entirely new way to interact with your computers. It’s more accurate than a mouse, as reliable as a keyboard and more sensitive than a touchscreen.  For the first time, you can control a computer in three dimensions with your natural hand and finger movements. The Leap can distinguish your individual fingers and track your movements down to a 1/100th of a millimeter.

SOURCE: http://leapmotion.com