Battery is included. Feature:Enjoy ultimate sound experience during those long flightsConverts the two (dual mono) airplane mini-plugs into stereo 3.5mm mini-jack connectionConnects directly to the 2-Prong airline audio jackWorks with any 3.5mm plug (1/8") headphones or earphonesGold-plated plugs
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Airplane Adapter for Universal 3.5mm Earphones Heaphones - Gold Plated