The Sony WM-BF 23 is a compact cassette player designed for portable use, featuring FM/AM radio capability. It has a lightweight design and is specifically built for convenience, making it ideal for on-the-go listening. The device is powered by batteries, which enhances its portability. It is equipped with a built-in speaker as well as a headphone jack for private listening. The unit has functionalities such as auto-reverse for continuous playback of both sides of a cassette. The cassette door is easy to open, allowing quick access to change tapes. In terms of specifications, the WM-BF 23 generally includes features such as a normal/metal tape selection switch, a built-in microphone for voice recording, and a tuning scale for radio. The aesthetic design often reflects a stylish, retro look typical of Sony products from its era, alongside a user-friendly interface.