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Swimate is a kind of armbands prepared to save people who is good at swimming sufferring from cramp during swimming and such circumstances.
Swimate is very thin in the common
situation, when facing dangers, users can press the cross on it，then it
will produce large amount of gas which can provide enough buoyant force to take the sufferer back to the water surface.
Si Chen Sheng Chen Wei Zhu Wei Xue