A disposable loading unit for operable attachment to a surgical stapling apparatus. The recording medium includes an audio stream prepared for after-recording data, and a audio attribute information having a bit rate information to the recorded audio stream as a management information. The strain sensor detects a stress acting in positive and negative directions of each axis with respect to three-dimensional coordinates using the center of the housing as the origin. The first and second switching elements have output terminals connected to the first and second subpixel electrodes, respectively.