Releases regular burst of mist to keep your home protected from insects (Controls flies, mosquitoes, moths, ants and American cockroaches and helps control German cockroaches and fleas). Use this refill with any Mortein Automatic Spray Unit. - Contains 98% natural ingredients and 1.4% trusted synthetic actives. - Ultra fine particles which evaporate in the air. - Each Refill lasts up to 30 days on the lowest setting.