Ambi Pur 3Volution Vanilla Bouquet 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). Vanilla Bouquet fragrance creates a warm, welcoming ambience in your home. 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.