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headphones 
Sound reproduction device made up of two earphones mounted on a headband.
connecting cable 
Electric cable that transmits sound to the headphones.
plug 
Terminal end of the cable with prongs that is inserted into an electric outlet (jack).
earphone 
Small speaker placed directly over the ear to listen to sounds from a stereo system or sound equipment.
adjusting band 
Device that adjusts the headband to fit the user’s head.
headband 
Flexible band that holds the earphones on the ears.
resonator 
Part of the headphones that is covered by a grille and houses the loudspeaker.