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CALLING-CASE / paper bag

CALLING-CASE
CALLING-CASE

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.

University

Zhejiang Univercity

Zhejiang Univercity
Hangzhou, China

Weiyue Gao,
Zhejiang Univercity

Hongmiao Liu,
Zhejiang Univercity

Honglie Wang,
Zhejiang Univercity

Yusen Wu,
Zhejiang Univercity