The most economically effective metered pyrethrin insecticide. Dispenses automatically to kill and repel flies, mosquitoes, gnats, small moths and other flying insects .EPA Registered for use in metered dispensers only; NSF/USDA Classification F1 .VOC Compliant in all states More than two times the size the standard Purge® III. Specifically designed for use in large, outdoor and sheltered applications such as arenas, barns, warehouses and more. Operates on four D batteries (not included).