Fresh Air One Refrigerator DeodorizerDESCRIPTION The Fresh Air Refrigerator Deodorizer creates a high concentration active oxygen to eliminate bacteria, odors, and trace pesticides inside refrigerators up to 300 L (10. 6 ft). Its microcomputer controlled 2 hour cycles ensure continuous freshness, while the low voltage indicator alerts you when the 4 C cell batteries need replacing. KEY APPLICATIONS: Extend the shelf life of perishable items Neutralize and prevent refrigerator odors