2003 D-CJ506CK
The D-CJ506CK is a portable CD player that supports MP3 playback and in-car use.
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The D-FJ401 is a hybrid portable CD player from 2004 that combined standard playback with built-in radio in a package aimed more at convenience than specialization. It handled pressed CDs and CD-R/RW discs with G-Protection, included a remote, and is often sold with the accessories needed to make it useful immediately.
That put it squarely in the everyday end of the lineup. The D-FJ401 is part of the part of the range where simplicity and availability mattered more than refinement once portable CD had settled into a casual, familiar role.