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3-speed adjustment:
Long press for 1 second to boot, the default 1 file is 4500 rpm, suitable for indoor, car and other sitting conditions .
Press the button once and enter the 2nd gear, 5500 rpm, suitable for outdoor activities .
Press the button again to enter the 3rd gear mode, 6500 rpm, suitable for strenuous exercise. In use, press and hold the machine for 3 seconds.

Features:
Electric Dust Mask has 5-layer high-efficiency filter, active carbon layer, can filter out dust, cut off 98% of most particles, adsorb harmful odors
when you move in a new residence, prevent vehicle exhaust gas, avoid pollen allergy, anti PM 2.5.
This product will protect your health from indoor activities such as carpentry or home renovations, to out