Many people run on a treadmill at the gym. Some of them might want to lose weight. While they are exercising, they listen to music on MP3 players. However, carrying MP3 players is sometimes bothersome. This MP3 player expands, and then exactly fits to the user`s wrist automatically. Therefore, it is very comfortable during exercising. In addition, it records the previous thickness of the user`s wrist, so it can tell how much weight is lost. It encourages dieters work harder.
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