Digrain flying & crawling insect destroyer is a ready to use insecticide aerosol for use in the home or office its RAPID KNOCK DOWN action is effective against a wide range of flying and crawling insect pests including Ants, Bed Bugs, Beetles, Cockroaches, both House & Cluster Flies, Fleas, Mosquitoes, Lady Birds, Spiders, Wasps and most other insects. sprayed either directly on to the pest or in to the room atmosphere a short 4 second burst is all you need.