Headphones, also known as They are also known as earbuds or stereophones or earphones or headsets,  are a single speaker or pair of small loudspeakers with a method and a  method of connecting to a signal source  such as the following  MP3 player or CD player or audio amplifier. 
     Earcup rest on the exterior of the ear and were the earliest headphone form designed. Other forms include  Circumaural, Earbuds, plus in-ear headphones such as Canalphones.
    Popular Earbuds brands include Westone UM3X Musicians Ear Monitor, Westone UM2 Dual Driver In-Ear Earphones Black, Westone 3 True 3-Way Driver Earphones and Westone 1 Earphones With Free iPod Speakers.
    Headphone transducers commonly employ one or more of several methods of sound reproduction Moving-coil or Orthodynamic or Electret or Electrostatic.  There are other much less common  Transducer Technologies include Ribbon planar magnetic, Magnetostriction and Heil Air Motion Transformer.

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