Refrigerator Fresh™ pure odor-absorbing crystal. Fights odors naturally. Lasts up to 12 months and is ecofriendly. The natural odor absorbing crystal works better and lasts longer than baking soda, is compact and space saving, is non-toxic and spill proof, and stops food from absorbing odor. Can also be used under the sink, in closets, bathrooms, cars, even gym lockers.