NWZ-S636F

The NWZ-S636F is an overseas S Series model in the sixth-generation family. It unified earlier S730 and S630 design elements while adding Omakase Channel playlist generation. It offers 4 GB of storage for MP3, WMA, AAC, and WAV files along with a 240x320 TFT display, FM radio with recording, WM-PORT, video and photo playback, Clear Audio, DSEE, and 40-hour lithium-ion battery life.

This unit came from the period where the S Series had become one of Sony's most naturally usable flash Walkman families. Earlier in the decade the line had bounced between sports identity, feature experiments, and semi-premium positioning. By the S63x generation it had become something much cleaner: a compact, polished, broadly appealing mid-tier Walkman with FM and a more media-friendly personality. The S line was no longer trying to explain why it existed.