The Cobalt uses A2DP Bluetooth (that's stereo Bluetooth, in layman's terms) to play music completely wire-free. The headphones, which are priced at $299.99, provide a 30-foot range and a rather paltry eight-hour battery life. The package includes two transmitters: one USB for use with a computer, and one standard 3.5mm jack connection for MP3 players.
Discuss: Photos: Koss headphones for 2007
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