<http://schema.org/caption>
"The Guitdoorbell was invented as a novelty by musician and instrument craftsman Dave Lynch for his Guitar Workshop store in Sacramento, to alert him when people enter through the door."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.kcra.com/article/photos-check-out-the-guitdoorbell/6346273>