Strong and weak winds can be adjusted at will USB fan air volume regulator Suitable for the very common 5.0V USB fan Insert the male head of the into the phone charger,, computer USB, fan plug, and then plug into the female head of the! Alternatively, use USB 5.0V power supply The output voltage range of this stepless smoothly varies between 2.5V and 8.0V, and the air volume can be set arbitrarily! And the range is wider! Turning the knob clockwise can increase the air volume, while turning it counterclockwise can reduce the air volume, and the knob has a switch function
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