Add your favorite essential oil to the included bottle. Insert the special orifice and wick. Screw it into the Carl diffuser. Apply the included magnetic clip then clip onto your vent. You will get a breeze of your oil instantly when the air is activated in your vehicle. You can adjust the output using the slider on top of the unit.
PLEASE NOTE: This unit does NOT actually diffuse essential oil. It creates a refreshing scent inside your vehicle. Using HEAT instead of cold AC air throughout the vent of your vehicle enhances the aroma greatly. It is not over powering but very mild.