Take the baking soda out of the back and out of the box. Super grip suction cups lets you move the unit closer to the source of odors. Flow-through design exposes 2X more odor-eliminating baking soda for full fridge freshness and full-time odor control. Provides up to 30 days of freshness. Scent: Unscented; Physical Form: Powder; Application: Refrigerators.