Caution: these are extremely concentrated fragrance oils. Please avoid direct contact with the skin or on surfaces that might be damaged (wood finishes especially). Please choose either a refill (silver cap) or diffuser in your choose of silver or hot pink. Each diffuser will provide many weeks of potent fragrance. The refills will fill the reservoir of the diffuser back up an additional 3 times. To use: unscrew the top and remove the plastic plug. Replace the lid and carefully invert the diffuser then quickly flip it back over. Do not oversaturate the wood or things might get messy. Replace the plastic plug (this is important ), screw the cap back on and hang from your rear view mirror with the attached string. Repeat as desired as the fragrance fades.