The Whisker OdorTrap is a replacement odor filter designed specifically for litter boxes. This 2-pack of units is made by the brand Whisker in the United States. The OdorTrap effectively traps and eliminates unpleasant odors from litter boxes, ensuring a clean and fresh environment for pets and their owners. With free shipping included, this product offers a convenient and efficient solution for maintaining a healthy and odor-free environment for your feline friends.