The Sony WM-F 28 is a portable cassette player introduced by Sony in 1986 and remained in the market until 1988. It features a built-in FM/AM radio, allowing users to seamlessly switch between cassette playback and listening to their favorite radio stations. The device is finished in a classic black color, embodying the design aesthetics of the 1980s. The unit operates on 2 AA batteries and is crafted in Japan, indicative of Sony's commitment to quality manufacturing. The WM-F 28 is part of a series that includes several other models, maintaining a consistent design and functionality across the range. This model is often noted for its ease of use and general reliability, making it a popular choice among cassette enthusiasts and collectors.