Aura Cacia Aromatherapy Car Diffuser1 Diffuser + 5 Refill Pads Use Aura Cacia's Aromatherapy Car Diffuser to transform your driving routine into a rejuvenating experience. Apply a few drops of pure essential oil to pad, insert into diffuser, and plug into the car's auxiliary power outlet. Avoid direct contact with saturated refill pads to prevent possible skin irritation. Do not allow saturated refill pads to come into contact with car interior. Keep out of reach of children and pets.