Ambi Pur 3Volution Air Freshener Plug-In Refill with Odourclear technology continuously cleans away tough lingering odours, leaving a light fresh scent for up to 90 days (if used 12 hours a day at minimum setting). Clean away tobacco odour with a light and fresh citrus fragrance. With normal plugs we get used to scents quickly, which means we eventually stop noticing the scent around us. Ambi Pur 3Volution air fresheners solve this problem by continuously and automatically alternating every 45 minutes between 3 complementary, high quality scents, for a continuous fresh experience. Use the Ambi Pur 3Volution refills only with Ambi Pur 3Volution devices, sold separately, to fill your home with air freshness and fragrance that you will keep noticing day after day, week after week.