About: http://webisa.webdatacommons.org/17853203

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	Footsteps can be detected when a piezo disc with an attached rod is mounted on or under a flat surface such as a wood floor or step.
http://www.w3.org/ns/prov#wasQuotedFrom	makezine.com