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This is a fire emergency device. When fire outbreaks, the main reason for most casualties is the dense smoke which makes breathing difficult.And Foam Filter can effectively solve this problem.When there is a fire, you
can open the glass shield of the Foam Filter and press botton PUSH,and you will see some small escaping bubbles. After gentle pats , the bubbles will become like a wet towel which can isolate the dense smoke.The design of this product can
effectively win more time for escape
and reduce casualties.