Mortein PowerGard Flying Insect Killer kills flies in seconds and controls for 8 hours when applied to surfaces. One spray kills flies, moths and mosquitoes in seconds. Kills flies in the air and where they land when applied to surfaces. Also kills cockroaches, ants, spiders, fleas and silverfish. Mortein's fastest on flies and the expert's flying insect killer. Mortein PowerGard Flying Insect Killer kills flies, mosquitoes and moths with one spray in seconds Controls flies for 8 hours when applied to surfaces Also kills cockroaches, ants, spiders, fleas and silverfish Kills flies in the air and where they land (When applied to surfaces). The expert's (our fastest on flies) flying insect killer. Kills flies over 2x faster vs Mortein fast knockdown fly and mosquito killer odourless.