This Air Wick, air freshener refill is designed for use with all Air Wick plug-in devices. Containing natural essential oils, the refill lasts for up to 100 days based on 12 hours usage/day on lowest setting. The scent fills homes with a continuous fragrance of soft peony and delicate jasmine, giving notes create a bright, uplifting floral aroma that freshens any room with a sense of tranquility.