Using this car air conditioning outlet aromatherapy clip is easy. First, clip it onto your car's air conditioning outlet. Then, add a few drops of your favorite perfume onto the fragrant tablets included in the package. As the air blows through the clip, it will spread the lovely fragrance throughout your car. When it comes to maintenance, you can replace the fragrant tablets when the scent fades. Just keep in mind that since the size is measured by hand, there may be small errors. Also, the color you see on your PC might be a bit different from the actual product. If you have any other questions, don't hesitate to contact us.