Instructions for use:     1. Press and hold the power button for 1-2 seconds to turn on the machine. By default, it enters the first gear, which is suitable for indoor and car use.    2. Press the button once to enter the 2-speed wind mode, suitable for outdoor activities.    3. Press the button again to enter 3 speeds, which is suitable for strenuous exercise.    4. Press and hold for 3 seconds to turn off the machine.Precautions:  1. It is recommended to wipe the surface of the mask with a wet towel or a little alcohol before use.    2. For the first use, it is recommended to set to a first-speed wind mode, and the air will be supplied automatically without suffocation.    3. During use, it is recommended to replace the filter chip within 3-8 days.    4. This product is not suitable for sharing with others. It is not suitable to use this product in rainy weather. The whole machine cannot be soaked with water.
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