While Litter-Robot already reduces litter box odors, OdorTrap works in tandem to stop odor in its tracks! OdorTrap technology uses plant-based oils to attract, attach to, and destroy odor molecules with natural chemistry-the ultimate pet odor eliminator. It neutralizes litter box odours. They use natural plant-based ingredients which are free from phthalates, parabens, and alcohol. They're easy to install and replace every two weeks. It is effortlessly compatible with any Litter-Robot model you have.