Etekcity 300ml Ultrasonic Aromatherapy Essential Oil Diffuser with Cool Aroma Mist (Certified Refurbished) This Certified Refurbished product is tested & certified by Etekcity to look and work like-new. The product includes all original accessories, and is backed by a 90-day warranty THERAPEUTIC:Relax with aroma diffusion. Add essential oil to up to 300ml of water. COLORED LIGHTING: offers up to 7 color options with two brightness options, a color cycle mode. TIMED MIST: Select up to 4 automated timer intervals (60min., 180min., 360min., ON). HYBRID DESIGN: Can be used as an essential oil aroma diffuser. a natural way to ease health issues - dry skin, sinus irritation, fatigue.