Portable Lifebuoy / survival

Portable Lifebuoy combines the waterproof case for mobile phone and the lifebuoy.
When the user is drowning, he can press the upper-
right corner button to start chemical reaction which
needs water, and it will produce the large amounts
of gas to inflate the internal lifebuoy.At the same time,
the lifebouy's expansion will start from the right side
of the product.
Finally, the user can try to use the mobile phone to
ask for the help in stable condition.