2005 NW-HD5
The NW-HD5 is a second-generation Network Walkman equipped with a hard disk.
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The NWZ-A15 is an A Series Network Walkman with 16 GB storage supporting MP3, WMA, AAC, FLAC, ALAC, AIFF, and Linear PCM playback. A lithium-ion battery provides up to 50 hours of use with digital noise cancellation and WM-PORT. It served as the entry-capacity model in the 2014 A Series range.
The globally branded A15 carries the same broader significance as the domestic A16/A17 generation. This is the A Series after Sony had stripped away a lot of the old multimedia clutter and turned the line into something much more focused, much more audio-first, and much more self-assured. The A15 is not trying to feel flashy. It is trying to feel correct.