Compact programmable unit Features: LCD w/REAL time clock, 5 or 7 days On/Off selection, 1-60 minute 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 cover. Operates on two C-cell Alkaline batteries. One unit recommended for a room area of 6,000 cubic feet. Batteries not included.