The Sony WM-EX 90 is a portable cassette player that was popular in the late 1990s. Designed with a compact body, this model is characterized by its lightweight construction, making it easy to carry around. The device features metal casing for durability and aesthetics. It is equipped with a Dolby B noise reduction system, which enhances audio playback quality by minimizing tape hiss. The WM-EX90 also includes a large, easy-to-read LCD display that shows tape and battery status. Its playback capability supports various tape types, including normal and metal tapes, providing flexibility for users. The device runs on two AA batteries, offering decent battery life suitable for extended listening sessions. It also features a headphone output for personal listening and a line-out for connection to external speakers or recording devices. The construction includes a sliding door mechanism to access the cassette compartment effortlessly, contributing to user-friendliness. Overall, the Sony WM-EX 90 combines functionality with a sleek design, catering to users looking for portable audio solutions during its era.