The Rubbermaid Commercial TCell Odor Control System Refill provides an inviting scent for 60 to 90 days. Using fuel cell technology, this air freshener refill creates hydrogen in the fragrance chamber to propel an equal volume of fragrance into the natural air flow for a fresher, more vibrant area. With no VOCs, this refill can use fragrance up to 33% more efficiently than traditional 30 day systems. For use with Rubbermaid Commercial TCell dispensers (sold separately). Scent: Wakening Spring; Physical Form: Oil; Application: Automatic Odor Control; Capacity (Volume): 48 ml.