About: http://webisa.webdatacommons.org/33120112

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Each device contains a light source, for example a light emitting diode, and a photoresponsive receiver, for example a phototransistor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com