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On some wireless sets , the transmitter uses radio frequency ( RF ) to communicate with the headphones . " Welcom to Hell , " croaks the DJ , hooking up Scott Thompson of the Kids in the Hall comedy troupe to headphones . You can listen through the LifeDrive ’ s buit-in speaker , headphones , or external speakers plugged into the headphone jack . Designed to address the rising consumer demand for in-vehicle entertainment , Delphi 's Overhead Mobile Entertainment System includes a visor-style overhead monitor , wireless transmitter , infrared wireless headphones , mounting brackets and installation hardware . It may be just a phase we're going through but lately we've been hearing a lot of extraordinary claims about headphones . On the sides are ports for headphones , the D.C. adapter , and a USB ( universal serial bus ) port for a PC interface kit that can be purchased separately . The audio-CASI methodology involves inmates responding to a computer questionnaire using a touch-screen , following audio instructions delivered via headphones . Students use it , but they spend much more time on Facebook , blogging , text messaging and with headphones . " " Now anyone with a computer attached to the campus network or the World Wide Web can listen to the NOAA stations free of charge , providing the computer also has a sound card , and speakers or headphones , " Sebenste said .