Flowtron 1 Acre Advanced Electronic Programmable Insect Killer Protects up to 1 acre - Outdoor Use Only Programmable Modes: 24/7; on at dusk, off at dawn; on at dusk, off 3 or 5 hours later Patented, high efficiency, non-clogging killing grid USDA tested OCTENOL mosquito attractant - FREE 30 day cartridge Rugged, weatherproof construction; will not rust, crack or fade