This compact yet effective air freshener is passive so there are no batteries required. Small and effective: designed with efficiency in mind. The date tabs show when it’s time to replace and the compact size contains 50-100 times more fragrance than a standard rim stick. Extreme versatility: allows you to place freshness right where it’s needed. Using the holder, you can attach The Curve to just about anywhere. It’s perfect for inside cupboards, near toilets, or even inside trash cans. Cotton blossom fragrance lasts 30 days.