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When disasters occur, the dispatch of relief supplies are of vital important. People always need a lot of volume to info others and keep order when giving out materials. There is always no such facility to make the sound loud enough.
Calling-Case takes fully use of the paper box, Just tearing a part of the paper box which was cut in advance and shape it, you will get a high-efficiency speaking device. With Calling-Case, people are supposed to have a loud-speaker as long as there are supplies by their side.
It is convenient and can easily meet our need of volume, and it can bring an effective way of rescue.