The Sony WM-EX670 is a compact cassette player and recorder released in the late 1990s. This model is characterized by its sleek design and portability, making it ideal for on-the-go music enthusiasts. It features a durable build with a modern aesthetic typical of Sony's portable audio devices from that era. The WM-EX670 supports metal and chrome cassette tapes, allowing for high-quality playback. Notable features include a three-head design for recording and playback, which enhances sound fidelity, and Dolby B noise reduction, helping to minimize tape hiss. Users appreciate the auto-reverse function, which allows for uninterrupted playback of both sides of a cassette without needing to manually flip it. Additionally, the device includes a headphone jack for personal listening and offers a variety of playback options, including normal and high-speed dubbing. The battery life is also commendable, with the ability to run for extended periods on standard AA batteries. Overall, the Sony WM-EX670 represents a blend of functionality, quality, and portability in the cassette player market.