The Sony WM-501 is a compact cassette player that showcases the brand's engineering prowess in portable audio devices. Designed for users seeking mobility without compromising sound quality, the WM-501 features a sleek design that is easy to carry and operate. The device supports normal (Type I), chrome (Type II), and metal (Type IV) cassette tape formats, allowing for versatile playback options. It is equipped with a built-in microphone for easy voice recording, and its headphone output provides a private listening experience. The WM-501 also features auto-reverse functionality, enabling uninterrupted playback of both sides of a cassette. The unit is powered by AA batteries, which provide a portable solution for music enjoyment on the go. Additionally, the WM-501 includes a simple user interface with playback controls, making it user-friendly for individuals of all ages.