The Sony WM-D3 is a compact cassette player and recorder that was released in the mid-1980s. It features a slim and lightweight design, making it convenient for portable use. The device is capable of recording and playing back audio tapes with high fidelity. The WM-D3 has a robust build quality and includes an external microphone input, allowing users to easily capture audio in various settings. It also features a built-in speaker for monitoring recordings and playback. The cassette deck utilizes Dolby B noise reduction, which helps improve sound quality by reducing tape hiss. Other features include a simple control layout with buttons for play, stop, rewind, fast-forward, and record, as well as a quick reverse function. The device runs on batteries, enhancing its portability and usability in various environments. Overall, the Sony WM-D3 is appreciated for its solid performance and ease of use in cassette playback and recording tasks.