The precious blend of 100% pure, natural and total essential oils contained in the refill for Zeta Free Complete Diffuser, produces a fresh and pleasant aroma that makes the environment unwelcome to mosquitoes. Effective indoors. 45 nights without hassle. Suitable for a room of approximately 16 m2. It is not necessary to ventilate the room before staying there. Safe for adults and children. Validity 12 months from the opening of the refill