This Febreze 3Volution Air Freshener Pet Odour Kit 20ml continuously removes odours and alternates between three complementary scents for noticeable freshness. It lasts up to 90 days (if used 12h per day at a low setting). With digitally controlled scent alternation - fresh scent travels further to fill your room with fragrance. It cleans away tough lingering pet odours and leaves a light fresh scent. The Odour Eliminator doesn't just mask but truly cleans away odours, leaving a fresh scent. It also lets you adjust the level of scent, helping you to create the ambience that you want when you want.