The Sienna Bamboo Diffuser is a great addition to any space. It features a beautiful, sustainable design that is stylish for any home or office. The ultrasonic design fills your room with an ultrafine mist which will allow for our essential oils to be suspended in the air for longer periods of time and for better inhalation. This process does not heat essential oils, keeping their holistic properties intact. The Sienna Bamboo uses tap water as well to keep things simple. Rotating LED lights create a soft soothing color changing effect or turn off the lights altogether.