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Use for snorkeling, if you want to dive into the water it can temporarily extend the time when under water. Take a deep breath before diving into the water, and turn the front knob to block the hole of breathing tube, and hold your breath and exhale slowly into the water, the air which spit it out will enter the interior of the balloon, the air by spits out is not entirely carbon dioxide. When running out of breath, you can breathe in the air of the bag. According to different body's condition, it may circulate approximately 2~3 times, at least extend two minutes under the water.
Southern Taiwan University