Scott 92621 Continuous Air Freshener Dispenser, 2 4/5 x 2 2/5 x 5, Smoke Continuous fragrance that works around the clock. Completely self-powered, no batteries to replace. Easy to install and no moving parts that can break. Lasts for 60 days on a single cartridge, which are easy to load. The sensible way to keep rooms smelling fresh.