This programmable unit Features: LCD w/Real time clock, 5 or 7 day On/Off selection, 1-60minute spray interval setting, customized Start & Stop time, Spray counter, Empty can reminder (3,000 sprays), Low battery monitor and operation indicator. With push button design for easy programming. With chemical resistance plastics. Operates on two D-cell Alkaline batteries. Design to fit With almost all-standard metered aerosol cans. One unit recommended for a room area of 6000 cubic feet. Batteries not included.