| 摘要 |
PROBLEM TO BE SOLVED: To prevent a pickpocket crime wherein a wallet is stolen from occurring. SOLUTION: On this wallet placed in a pocket, a sound generating electronic unit having a photosensitive sensor is provided. In the pocket, light is shut out, and the sound generating electronic unit stops, and the sound is stopped. When the wallet is lifted to take out the wallet from the pocket, light hits the photosensitive sensor, and the sound generating electronic unit operates, and the sound starts. Therefore, a user notices that the wallet is about to be stolen, and the pickpocket crime can be prevented from occurring.
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