Airscrew Design - Aluminum body with polish & plating technology, high texture,Applied to Different Vehicles - Airscrew could be rotated by hand , the air outle type vehicle type and wind speed all could affect the rotation, may not rotate automatically.,Rotation Condition - wind speed 3 meters/s,INSTALLATION - Unscrew the upper part of Air Force II, take a fragrant slice and put into the container, then cover it, insert it into the air vent, open the car air conditioner, gently turn the propeller by hand, then the fragrance will spread out.,,Material:Aluminum,Item Weight:2.9 ounces,Product Dimensions:4.3 x 2.6 x 4.3 inches