The compact design conveniently fits in any purse/handbag so you always have it when you need it. To fill your preferred scent into the applicator pen, simply unscrew cap and soak the tip for 1-2 minutes. This will fill the resevoir wick with enough perfume to last 1-2 months of average use. To change perfumes, soak the tip in pharmacy grade alcohol for 1-2 minutes then re-soak in new perfume. Additional tips sold separately.