A San Francisco teenager has invented a gadget that turns iPods into miniature radio stations, broadcasting beats to nearby devices. The system, called NoeStringsAttached, uses FM radio waves to transmit music from a portable music player to any other specially equipped player within 15 feet. The NoeStringsAttached system consists of two identical units. Each one plugs into the standard headphone jack found on most MP3, CD, and tape players. A user selects one of five radio frequencies and then opts to transmit or receive music by flicking a switch. (The five frequencies were specially selected because they are not often used by traditional broadcasters, but in theory, the device could pick up FM radio stations.)

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