 No more expensive filters to have to buy and schedule and replace, saving you money and hassle month after month. Just turn on your Edenpure Thunderstorm. You can hold one in your hand. They're only about this big. And all you have to do is turn them on and forget about it, quietly working in the background, cleaning and freshening the air in your home or office. The Thunderstorm gets rid of stinky odors and gets rid of those annoying filters.