Newly designed fragrances for the womens' restroom stalls. One Brain by the door and one Drone for each stall. Use the Brain at the entrance door and place one Drone in each stall at the odor source. The Brain's replacement system tells you when to replace both the Brain's and the Drone's air fresheners. Layered fragrances provide unparalleled performance for the restroom at low-cost. The unique design uses airflow created by doors. The more the door moves, the more fragrance is released. Gradually releases more fragrance than gels or metered aerosols over 30 days. Creates a great first and last impression in any restroom. Lifetime guarantee on the Brain. Register it..if it ever stops working, we replace it .. FREE! Refills and power packs are both part of the free closed loop recycling program.