WM-FX700

The WM-FX700 occupied a late spot in Sony's FX-series radio cassette Walkman released in 2003. It features digital tuning for FM/AM alongside Mega Bass enhancement and a notably slim metal-accented body powered by a single AA battery that achieved around seventy-two hours of playback, with the addition of an adjustable playback-speed control intended for language study or precise tape listening.

As cassette Walkman entered their twilight Sony experimented with niche utility features to differentiate remaining models from purely recreational ones. This unit existed to support users who needed variable speed for educational or review purposes while keeping radio capability, distinguishing it within the FX family as a specialized tool that extended the format's usefulness into functional everyday applications even as digital players took over.