Our Air Wick Essential Oil Plug In devices are compatible with all Air Wick Plug-In refills and diffuse your chosen refill fragrance to reach every corner of your room for up to 100 days. ** Insert refill and simply plug the device into an upright electrical outlet to enjoy long-lasting fragrance infused with essential oils. The device also has adjustable intensity levels so that you can customise the fragrance intensity to suit your home.