Manufactured in the United States, F-Matic sources premium fragrances that will last a full 60 days. No need for fillers or propellants. Effortless installation: No wrapper, no battery. The one-step twist and click activation is simple and efficient. The F-Matic Twist fits competitors' existing dispensers for easy switchover. Covers 6,000 cubic feet. Reliable, gravity-fueled system doesn't rely on batteries, fuel cells, or any other artificial means of power. The audible CLICK means the cartridge has been activated and sealed against leakage.