NW-S754K

The NW-S754K added speaker support to the eighth-generation S Series Walkman with standardized noise cancellation. It features 8 GB storage supporting MP3, WMA, AAC, and WAV playback, video, and photo. The lithium-ion battery provides 42 hours, with WM-PORT, Omakase Channel, noise cancellation, and built-in speaker.

The K version extends the same S754 platform into an accessory-driven retail package. The underlying player was already stable, so Sony could build around it instead of redefining it.