(1) Plug in dispenser. Plug in to a better air care experience. The high-speed fan draws air through the charcoal filter, helping to clean the air for a better experience. The rotating plug works in any 3-prong outlet and rotates by 90 or 180 degrees. The intensity button allows you to select the right setting, and there are no screws or tape needed to install. The 30-day air-freshening for larger spaces. Dry fragrance refills contain 3-5 times more fragrance than grocery store purchased plug-ins and freshens more space. Taking care of the planet is important. Refills are 100%.