With The Candledust car air freshener refill capsule, you can replace an existing capsule whose scent has faded. The scents last for at least 4 weeks and you can enjoy forever-lasting freshness either by purchasing refills or by replenishing your capsule with our fragrance oils. A variety of fragrance refills and oils are available to suit your preferences. The package includes one refill capsule. Refilling Your Car Diffuser with Fragrance Oils: -->Open the car diffuser holder. -->Add a dropper full of perfume to the scent capsule. -->Close the holder and enjoy the refreshed scent in your car. -->Refilling Your Car Diffuser with Fragrance Refills: Or -->Open the car diffuser holder. -->Insert a new capsule into the holder. -->Close the holder and enjoy the refreshed scent in your car. Every car owner’s dream is to have a consistently pleasant environment in their vehicle, and The Candledust Car Air Freshener makes that dream a reality.