Place 10 – 20 drops of your favorite essential oil onto the ScentBall diffuser pad and slide the saturated pad under the grill of the diffuser. Plug in the diffuser and enjoy the aromatherapy of plant extracts. Aromatherapy scents will begin to diffuse within 5 minutes. Refresh the reusable cotton pad with one or more essential oils to create a unique aromatherapeutic experience. Add essential oils as often as desired. ScentBall Aromatherapy diffusers pads are reusable and each diffuser includes 5 long pads.