The Fridge-n-Freezer box should be replaced roughly every 30 days. Setup instructions say to remove the front and back panels and place the box upright in the fridge or freezer.
Descriptions say the baking soda absorbs odors to keep food tasting fresh and that the fridge box and powder can be used in enclosed spaces where odors linger, such as closets, pantries, and under sinks.
Arm & Hammer baking soda is offered as a solid deodorizer (fridge/freezer box) and as powdered baking soda.
Listings show small fridge/freezer boxes (14 oz) and larger powdered packages such as 3 lb and 5 lb bags.
Descriptions specify using it as a leavening agent for baked goods and note it is suitable for cooking and baking (examples include cookies, pancakes, and cakes).