To use an essential oil diffuser, you can:  Fill the diffuser with water: Add water to the fill line, usually about 1 cup. You can use tap water, but distilled or purified water is recommended to avoid mineral buildup that can damage the diffuser.  Add essential oil: Add 5-10 drops of essential oil to the water. The number of drops you need may vary depending on the diffuser and the oil.  Turn on the diffuser: Press the power button and choose your desired settings.  Enjoy: The diffuser will disperse the essential oil into the air.  If you're pregnant or have allergies, you can take special precautions when using essential oils:  Be careful with smellPregnancy can increase sensitivity to smell, so you might want to try putting the oil on a tissue or cotton ball for inhalation.  Avoid skin contactSome essential oils can cause skin irritation or rash, so avoid putting them directly on your skin.  Stop use if you have an allergic reactionIf you suspect you're allergic to an essential oil, stop use immediately and open windows and doors to allow fresh air in.  Keep your laundry smelling fresh with the Dryer Ball Fragrance Oil Refill. This 2oz refill offers over 30 scent options to choose from, ensuring your clothes have a delightful fragrance. Fragrance Variety: Choose from over 30 different scents to customize the aroma of your laundry. Prevents Clumping: Helps prevent laundry from clumping together in the dryer by tumbling between layers and separating fabric. Air Freshener Type: This oil refill falls under the category of Home Fragrances, specifically Air Fresheners, adding a pleasant scent to your clothes as they dry.   Ingredients: Plant derived carrying oil, phthalate free & vanillin free fragrance oils.