You can now take 168 from your home to on the road with our new car fresheners! One unit will last around 30 days, depending on how often you saturate the lid. These were made for the car, but I have also hung them in closets and bathrooms. I actually had a lady tell me she plans to hang the Tree Farm scent in her artificial christmas tree to make it smell real lol! How to use: * Take the car freshener out of the package and remove the wooden lid. * remove the plastic stopper and throw the stopper away. * Screw back on the wooden lid and tie in a double knot from your rear view mirror. * Flip upside down for 10-15 seconds to saturate the lid * Enjoy :) PSA: If oversaturated, the lid can become loose when driving so make sure you check it often to make sure the lid is tightly secured!