Plug in to a Better Air Care Experience. Improves Air Quality The high-speed fan draws air through the charcoal filter, helping to clean the air for a better experience. Easy to Use The rotating plug works in any 3-prong outlet and rotates by 90° or 180°. The intensity button allows you to select the right setting, and there are no screws or tape needed to install. Premium Performance 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. Battery included with each refill.