WM-F101

The WM-F101 is the radio counterpart to the slim WM-101, adding FM, AM, and TV audio reception to the same ultra-compact gumstick-battery chassis. Auto-reverse and Dolby B remain standard, while the external AA adapter option carries over for longer sessions away from a charger. Sony fit the tuner controls neatly into the same slim body without compromising the cassette-player layout that made the original 101 so appealing.

Sony proved that the new rechargeable slim-body formula was not limited to playback-only players. By extending the concept to radio, the company made the format more complete and more adaptable to daily life, especially for commuters and travelers who wanted broadcast listening without falling back to a bulkier player. It quietly helped normalize the shape of later Walkmans.