NW-S313K

The NW-S313K is a thirteenth-generation S Series model with 4 GB storage supporting MP3, WMA, AAC, and WAV files. It uses a 77-hour lithium-ion battery with speaker output, photo playback, and Clear Phase.

The speaker K variant retained the simplified thirteenth-generation positioning. It is the same late simplified S platform with speaker packaging added on top. The underlying role of the player is a late Walkman branch that exists because there is still a quiet use case for a compact, low-maintenance music device.