The Sony WM-103 is a typical example of a portable cassette player released in the 1980s, showcasing the brand's commitment to innovative audio design. It features a compact and lightweight build, making it easy to carry around for music playback on the go. The design incorporates a straightforward interface with play, stop, fast-forward, rewind, and record buttons all easily accessible. The WM-103 generally employs a simple analog tape mechanism that allows users to enjoy their favorite cassette tapes with decent sound quality. Specifications may include features such as a built-in microphone for recording, an automatic stop function when the tape ends, and a headphone jack for private listening. The device's power source typically consists of standard AA batteries, providing convenience and portability. The WM-103 also showcases a basic but functional aesthetic, often constructed with durable materials to withstand daily use.