Scratch N Sniff. Up to 90 days (Per pack based on low setting) of fresh release. Infused with essential oil. Fits: Glade AirWick, & Renuzit Scented Oil Warmers (For use in Renuzit (Model No. M292) Glade (Model No. SCJ168), and AirWick (Model No. ED74) Air Fresheners). Questions? Call: 1-866-Renuzit. Made in Mexico from domestic and foreign ingredients.