Dispenser features Oxy-Gen Powered technology that is a clean source of power. It produces continuous levels of intense fragrance that contains no propellants, solvents or CFCs - just pure natural scent. It harnesses the power of pure oxygen to deliver continuous, consistent ambient fragrance and cover up to 3,000 cubic feet. Vented sides provide effective fragrance dispersal. Perfume oil is gradually dispersed, delivering continuous and consistent fragrance intensity. Unique cellular diffuser will not dry out or become saturated too quickly. Refills (sold separately) are simple to install. Simply twist and go. Indicator lights display operation (green), refill needed (yellow) and batteries needed (red). Wall-mountable dispenser operates on two AA alkaline batteries (sold separately). Battery life lasts up to two years.