EFFICIENT COOLING POWEREquipped with a brushless motor, the fan can create strong wind with low energy consumption and noise. 3 speed options for you to choose for different occasions, and the airflow could reach 2053rpm and 6 ft./s at the highest level, providing effective air circulation for cooling cars, trucks, buses, RVs, etc. RETRACTABLE MOUNTINGFeaturing a retractable cup base expands from 2.67'' to 3.82'', this fan is an innovative vehicle-mounted air circulator for all car riders. By rotating the hexagonal, you can stretch out or draw back the 3 mobile blocks to fix the fan in the cup holder or remove it from holder. Quick and easy installation for anyone to handle. ADJUSTABLE CONVENIENCEThe gooseneck is made of thick aluminum and wrapped with PVC rubber, offering moderate hardness to freely bend and enough support for the fan head. With an omni-directional socket and 3.3ft USB cable, the fan head can 360 rotate, making sure it blows to where you want the most. USB POWEREDCarrying no battery, this fan is USB powered, which supports multiple power supply, like car charger, power bank, laptop, or any USB-enabled devices. It is great for defogging, cooling, and air circulation on long trips without worrying of running out of battery and battery safety issues. COMPACT & PORTABLEThe slim design makes it great to install in small and narrow space. It is suitable for use in a variety of vehicles. Weighs only 0.9 lb. (426g), it is lightweight and portable for easy transport. The best replacement to car air conditioner this summer