The Sony WM-FX665 is a portable cassette player that combines the convenience of a radio tuner with the classic functionality of cassette playback. It features an AM/FM tuner, allowing users to enjoy their favorite radio stations while also providing the ability to listen to cassette tapes. The design includes a compact and lightweight structure, making it easy to carry and use on the go. The device is equipped with a headphone jack for private listening and typically includes built-in speakers for casual use. It operates on batteries, offering flexibility for outdoor or mobile use. The user interface includes basic controls for play, stop, rewind, and fast forward, ensuring straightforward operation. The WM-FX665 often includes features like auto-reverse, allowing for uninterrupted playback of both sides of a cassette. The sound quality is generally acceptable for casual listening, with a basic equalizer for adjusting audio levels. It is a practical choice for those who appreciate the charm of cassette tapes and the functionality of a radio.