USB fan stepped Regulator Fan speed principle: The non-adjustable USB fan has a direct 5-volt electric fan motor, while the two-speed fan has a circuit board in it, when it is inserted into the second gear, the amplifier board raises USB 5 volts.

When the engine is connected, the air volume will be large.

The stepless regulator output voltage range ranges from 2.5 volts to 8.0 volts and the air volume is arbitrarily adjusted and the scope is wider.

Turn the knob clockwise to increase the air volume, counterclockwise to decrease the air volume and knob with knob function.

Stock Code :w3531-004