The AmritaBall Diffuser plugs into an electrical outlet and gently diffuses aromatherapy essential oils by warming them slightly. After placing 10 drops (maximum) of an essential oil or blend on the stiff rectangular cotton pad, insert the pad into the slot on the ball. After five minutes, your essential oil will diffuse up to three hours in an area up to 500 square feet. The Amrita Ball is an inexpensive, convenient way to diffuse essential oils and is especially useful when traveling. Includes 10 reusable cotton pads.