Pure Essential Oils Aromatherapy Mist Positive Change Project Ultrasonic Vibrations Disperse Essential Oils in a Cool-Mist Diffusion Bring aromatherapy into your everyday space. The Aura Cacia Essential Oil Diffuser utilizes ultrasonic vibrations to disperse a fine, cool mist of essential oils and water. By not using heat, the natural aroma profile of essential oils is protected. Its simple, modern design works well in any room. Features: Ultrasonic cool-mist diffusion Easy to use and clean Auto shut off, choose between 1 or 4 hours run times Soft LED candle light with on/off features Runs quietly Specifications: Dimensions: 5.3 in x 5.3 in. x 4.6 in. Coverage: 538 sq. ft. Water capacity: 6 fluid ounces Power adapter: AC/DC 100-240V