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Sports injury always happens when skiing, climbing the snow mountain and exploring the polar. Especially when a person being stranded due to the snowslide. In such cases how to make a distress call effectively is the important key of being rescued.
This is a device to send distress calls. After pressing the button, it will be swelled to blast in a short time. Than the colorant squirt out and redden the white snow. Owing to capillarity the fluffy snow will make the red areas get bigger and bigger. It is effective to attract rescuer.
Liu Yi Xu Wei Meng Luhua Li Ke