1. Efficient air circulation: effectively lowers the temperature inside the car and reduces humidity inside the windshield in humid weather. This car electric window exhaust fan can also help remove bad cigarette smoke, formaldehyde, smoke and unpleasant odors as quickly as possible. 2. USB charging design: The car exhaust fan can be connected to the USB port in the car, and charging is quick and convenient. Universally suitable for any car, truck, golf, off-road vehicle, RV, SUV, etc. 3. High-speed exhaust: The upgraded motor design significantly improves the exhaust speed of this exhaust fan; the exhaust fan runs at a speed of 4000 revolutions per minute. 4. Easy to use: Easy to use and operate, just take out the cable and connect it to the USB port of the car or power supply, turn on the power switch, press the fan switch, and the machine starts working. This exhaust fan has a sensitive switch control, which can easily turn on/off the fan, the middle switch controls the middle fan, and the right switch controls the left and right fans.