Keep the air in any room smelling sweetly and automatically with this dispenser. The unit is fully and easily programmable to dispense at the intervals you want and it will deliver 3000 sprays per refill. It requires 2 C Cell alkaline batteries which will last up to 36 months. There is a refill indicator which shows the number of days remaining until a refill is needed and it comes with a 10 year warranty. Refills and batteries are sold separately.