About: http://webisa.webdatacommons.org/193692542

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	These arrangements require a source of electrical power such as batteries, rendering the device cumbersome and susceptible to failure if the electrical power source is interrupted.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com