Aerosol dispensing, odor-control system automatically alternates between two complementary scents for renewed freshness you will notice every day. Alternating scents eliminate fragrance fatigue. You decide which fragrance will spray and when, thanks to the programmable freshness. Alternate fragrances hour to hour, night and day, or day to day. Cost-effective solution delivers high-quality oils dispensed through Microburst technology for longer-lasting performance. One highly concentrated, refill set for the Microburst Duet Dispenser replaces three standard refills and lasts up to 180 days between refill changes, significantly lowering labor and odor management costs. All refills contain MicroTrans odor neutralizer. Refills are sold separately. Easy-to-view LCD on the front indicates the number of days to refill and program mode. Dual-fragrance, odor-control system runs on two C batteries (sold separately).