NW-S13K

The NW-S13K is a compact S Series model that replaced the E Series. It provides 4 GB storage for MP3, WMA, AAC, and WAV files with a 77-hour lithium-ion battery, Bluetooth, speaker output, video and photo playback, and Clear Phase.

The speaker K variant completed the entry-level handoff from the E Series. It is the same handoff-generation S platform with speaker packaging added on top. That matters mostly because it confirms how settled the core player had become. Sony was comfortable extending it into speaker variants because the base role was already obvious.