Operates on two low cost "C" cell batteries, with up to 3-year battery life., Effective in room sizes up to 200m3 / 6000ft3, Choice of 3000 or 9000 metered sprays per refill. It automatically delivers small bursts of fragrance at specific intervals in order to keep malodors at bay. The dispenser provides flexible and easy to use programming options, and can be set to match your exact location conditions. Available with four desirable fragrance varieties; Citrus, Cool, Mystique and Zero - a superb smell neutraliser.