Now solutions ultrasonic glass swirl USB oil diffuser unites scientific innovation with the timeless tradition of aromatherapy to create a BPA-free diffuser that uses only tap water and your favorite essential oils. Instead of Heat, This contemporary diffuser utilizes high frequency ultrasonic electrical vibrations to create an ultra-fine mist, which helps to maintain essential oil integrity and holistic properties. With an automatic shut-off and up to five hours of whisper-quiet operation, This attractive diffuser with rotating complements your healthy lifestyle and is ideal for home and office. Extremely quiet, heat free and easy to clean, color Changing LED diffuser.