Place 4-6 drops of any of the Veriditas Organic essential oil or blend that can be diffused onto the car diffuser pad. Slide the pad into the diffuser and plug unit into the lighter outlet. Provides aroma-therapeutic benefits for the mind, body and spirit for up to 3 hours. Remove the Aromatherapy Car Diffuser when not in use. For best results, use a new car diffuser pad when switching oils Includes the card diffuser and 5 replacement pads.