WM-FS555

The WM-FS555 is a sport-focused cassette Walkman within Sony's FS series introduced in 2002. It integrated auto-reverse playback and Mega Bass enhancement with a built-in FM/AM radio tuner that extended to TV and weather bands, all enclosed in a rugged body engineered for shock and weather resistance. Powered by one AA battery, the design includes a reflective hand strap with belt clip and specialized ear-clip headphones suited to movement during outdoor activity.

Sony maintained the sport segment of the Walkman catalog during the format's late phase to appeal to active users unwilling to abandon cassette playback. This entry aimed at exercise enthusiasts and outdoor listeners who needed durable radio and tape options that could withstand motion and elements, distinguishing itself from standard indoor models while bridging the gap to the final generation of portable cassette devices before digital dominance.