Energy-efficient air freshener is an ideal solution for large commercial spaces & for the environment. Glade electric warmer gently warms the fragrance-infused gel cartridges so scent is released gradually & doesn't overpower. The electric warmer is powerful enough to provide fragrance for even your larger rooms. Air freshening device plugs into standard, 120 volt outlet. One fragrance cartridge lasts up to 30 days. Air freshener kit includes an electronic warmer & a Clean Linen fragrance cartridge. Clean Linen fragrance recalls the freshness of warm spring breezes blowing through the laundry outside.