Chem-Tech Ltd. Prozap® kills flying and crawling insect pests. It works 24 hours a day for up to 4 months. No assembly is required, you just open the foil pouch and hang in an open area. The ProZap is effective against flies, mosquitoes, gnats, moths, spiders, cockroaches, silverfish, beetles, earwigs and other pests. 2.8 oz.