<http://schema.org/description>
"Ever had to answer your cell phone in the middle of a busy street? You could shout above the din or let your call go to voicemail, or you could speak clearly into a noise-canceling headset."^^<http://www.w3.org/2001/XMLSchema#string>
<http://electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headset1.htm>