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It is worn at the elbow of the user in the form of elbow strap.When the user is in danger in the water ,the air box is crushed by pressing to make the air bag in the air box inflate rapidly within 3S.After
inflation,the air bag has a buoyancy of 110kg. After inflation,the air bag will not hinder the user’s movement,and the user can swim with the air bag.The main color of the air bag is orange.There is a reflective strip on the air bag to help the user to be found in distress. The air bag can help the user to float on the water surface without hindering the movement.