Assertion: piezoelectric speaker | /r/ObjectUse | used as beeper
Facets:
value: in other electronic devices
type: LOCATION
value: in watches
type: LOCATION
value: frequently
type: TEMPORAL
Source sentences:
text: Piezoelectric speakers are frequently used as beepers in watches and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios.