Country Vet Mosquito & Fly Spray is EPA-registered, USDA-approved kit controls flies, mosquitoes, gnats and moths automatically 24 hrs a day for a full 30 days! Insert 30-day fly spray refill & forget about it. Features 15 minute spray setting and on/off switch. Includes automatic metered wall dispenser and 1 metered fly spray refill. Contains 1.76% pyrethrins and provides enhanced performance with lemon-scented Geraniol, a botanical repellent of flies and mosquitoes. Easy-to-install refills sold separately. Easy-to-mount dispenser can also be used for air freshening. May be used in horse, dairy or poultry barns, kennels & animal care areas. Requires 2 D batteries (not included).