Assertion: digital hearing aid | /r/MadeOf | at least one microphone
Facets:
value: to pick up sound
type: PURPOSE
Source sentences:
text: All digital hearing aids contain at least one microphone to pick up sound, a computer chip that amplifies and processes sound, a speaker that sends the signal to your ear and a battery for power.
text: Today, all digital hearing aids contain at least one microphone, a computer chip to amplify and process sound, a speaker and a battery.