Released in 1987, the Sony WM-109 was the first Walkman to feature a wired remote control. Basic functions such as playback and stop could be operated without taking the player out of a pocket or bag, introducing a control concept that would become widely used on later Walkman models.

Its slim, lightweight body incorporated auto-reverse and supported Dolby B noise reduction and Metal tape playback. Sony also placed strong emphasis on appearance, promoting the elegantly rounded design in Japan with the nickname “Bijin Walkman,” meaning “Beautiful Walkman.” Bright finishes including white reinforced its fashionable character. The WM-109 represents a period when portable music players were evolving from purely functional electronic devices into personal fashion accessories, while its pioneering wired remote anticipated a feature that became characteristic of later portable audio products.