Assertion: headphone's ear cup | /r/HasAspect | a volume control
Facets:
Source sentences:
text: One ear cup has a volume control, the on/off switch for the active noise-cancellation and a blue light that indicates when noise-cancelling is in use.
text: One ear cup has a volume control, the on/off switch for the active noise-cancellation and a blue light that indicates when noise-cancelling is in use.