The NW-S203F/NW-S205F is an MP3 player. It is developed for users who want to enjoy music while jogging, walking, or playing sports. On a simple stick and ring design, the designer positioned the operating buttons in a straight line, enabling the user to quickly operate replay, pause, volume adjustment, etc, with one hand. A bright, easy-to-read organic EL is used for the display. The design introduces a wide variety of devices to achieve ease of operation while attached to the user’s body. To present the image of a functional tool that users would feel like carrying all the time, the designer avoided casual materials.