<http://schema.org/about>
"This device is a night vision scope, and quite fortuitously, it doesn't require any batteries. Instead, it's has a lever-activated power supply, so you can generate your own power ad hoc, and thereby see in the night, without fear of energy failure (that"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/gadgets/hand-powered-night-vision-monocular.html>