Lasts up to 30 hours, grab this Mortein NaturGard Auto Outdoor Insect Control System Pack! It provides protection against flies and mosquitoes with a plant based active ingredient. Convenient and effective, with a mountable unit and an adjustable setting, it releases bursts of mists at regular intervals. This pack includes 1 diffuser unit, 1 Mortein Aerosol Refill Can and 2x AA Alkaline batteries. Hurry in now!