Dual Headphone Adapter
Encyclopedia
A dual headphone adapter is a device that allows two headphones to be connected through to one audio jack. They are quite useful when wanting to share music with friends, such as on an MP3 player, CD player, or boombox
Boombox
Boombox is a colloquial expression for a portable cassette or CD player. Other terms known are ghetto blaster, jambox, or radio-cassette. It is a device capable of receiving radio stations and playing recorded music , usually at relatively high volume...

. Although earbuds, a type of headphone design, can be shared with a friend (with one bud in another's ear), a dual headphone adapter can be more practical. They can purchased at various audio/visual and electronic stores, such as RadioShack
RadioShack
RadioShack Corporation   is an American franchise of electronics retail stores in the United States, as well as parts of Europe, South America and Africa. As of 2008, RadioShack reported net sales and operating revenues of $4.81 billion. The headquarters of RadioShack is located in Downtown...

, for as little as $5 USD.
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