The Sony WM-EX 777 is a compact portable cassette player that was popular during the 1990s. It features a sleek design, lightweight construction, and a variety of playback options suitable for different listening preferences. The player comes with a stereo headphone jack and supports various sound playback modes including normal, chrome, and metal tape types. It incorporates a belt-driven mechanism to ensure smooth playback and minimal wow and flutter. The WM-EX 777 also includes features such as auto-reverse, which allows for uninterrupted listening of both sides of a cassette without manual intervention. Additionally, it has a built-in microphone for recording purposes, enabling users to capture audio on-the-go. The dual-battery compartment supports both AA and rechargeable batteries, providing flexibility and extended playtime. The device also features a clear LCD display that shows playback information, making it user-friendly. Overall, the Sony WM-EX 777 combines functionality with a compact form factor, making it a convenient choice for music lovers of its era.