Travel in style with your favorite essential oils! o Plugs into the lighter outlet of your car o Features 5 diffuser pads o Aura Cacia Aromatherapy Car Diffuser 1 Unit o Sold by Swanson Vitamins. Directions: Place 4 to 6 drops of any pure Aura Cacia essential oil or blend onto diffuser pad. Slide pad into diffuser and insert into lighter outlet. Remove diffuser when not in use. A refill pad may be used until it hardens. For best results, use a new refill pad when switching oils. Freshening Car Diffusion Blend - Add 3 drops eucalyptus 3 drops bergamot to refill pad and diffuse when stuck in slow-moving commuter traffic or in crowded city driving. Road Trip Car Diffusion Blend - Add 3 drops peppermint and 3 drops grapefruit and diffuse during long trips.