XLX 3PCS 5W Mini USB Fan Air Volume Speed Stepless?Governor Module USB Speed Controller DC 5V USB Male input DC4-12V to 2-5-8V and Speed Control Knob

Module highlights: USB fan air volume regulator Strong wind and weak wind are free to adjust USB fan stepless governor Fan speed principle: The non-adjustable USB fan is a 5 volt electric fan motor directly, while the two-speed fan has a boost circuit board inside. When placed in the second gear, the booster board raises the USB 5 volts. When the motor is connected, the air volume will be big. The stepless governor output voltage range varies from 2.5 volts to 8.0 volts, and the air volume is arbitrarily set! And the scope is wider! Turn the knob clockwise to increase the air volume, counterclockwise to reduce the air volume, and the knob with switch function It is suitable for 5.0V USB fans  Instructions:  Insert the governor into the phone charger or charging treasure, insert the fan USB plug into the USB port of the governor, and then turn the adjustment knob to adjust the small air volume and large air volume.Or use Micro USB 5.0V to supply power Package Including:  3 x Fan Air Volume Speed Regulation Module Specification: (1) Power supply range: DC 4~12V (2)Rated power: 5W!(do not overload) (3)Output range: DC 2.5~ 8.0V (4)Weight: 14g Special note: This is used for two-speed adjustment of the fan, if the fan is placed in the first gear, there may be no speed adjustment.