Give 'em hell with a pleasant smell. Tomcat Repellents Rodent Repeller Refill Pack contains two 100% natural essential oil refills to be used with the Tomcat Repellents Rodent Repeller warmer, a plug-in that helps keep mice out of your home. This indoor repellent diffuses fresh lemongrass, cinnamon, and peppermint oil aromas that are pleasing to us, but not to mice. The oils work to ensure mice stay away for up to 120 days (up to 60 days per refill on low setting). Tomcat Repellents Rodent Repeller is perfect to use in any indoor space, including basements, garages, and attics. Plus, it is safe to use around kids and pets (when used as directed). Simply unscrew the cap from the included fragrance bottle and insert the bottle into the warmer. Once inserted, plug the warmer into an outlet, enjoy the smell of cinnamon, lemongrass, and peppermint, and say farewell to the mice that have been causing you trouble. One warmer can cover a room up to 400 sq. ft., so you'll have all your bases covered. One package of Tomcat Repellents Rodent Repeller Refill Pack includes two fragrance bottle refills.