A Walkman promising better audio performance in a smaller unit. The development objective: "a Walkman the size of a cassette case." Key aspects of the design identity are a clear rounded window that instantly reveals if a cassette is loaded and diagonal control buttons. The battery compartment, heads, pinch rollers, and headphone jack are all arranged in a row, and this component is slid over when loading a cassette. To encourage a broader user base, the WM-20 was offered in several colors.