The Bounce Dryer Bar automatically freshens your laundry for about 4 months, depending on frequency of use and dryer settings. It is also great for controlling static cling and softening your clothes. You just stick it and forget it! You stick it inside your dryer and it automatically freshens your clothes. Gives you outstanding freshness, softness and static control. Latest form from Bounce that makes laundry easier and more convenient. No sheet to throw away after each dryer cycle. Safe on all household dryers. A replacement indicator will appear; simply remove the bar from the holder and replace with a new one. One less thing to worry about in your laundry.