ULTRANSMIT Ultrasonic Aromatherapy Essential Oil Diffuser, Ultrasonic Air Humidifier with Night Light Diffuser with Auto Shut- Off (White) MELT AWAY STRESS, RELAX, and REJUVENATE with the most advanced and effective method of diffusing tap water with a few drops of your choice of essential or fragrant oil, using ultrasonic aromatherapy technology AUTO SHUT- OFF when water runs low- adds to safety, energy efficiency, and peace of mind- especially for use at night SOOTHING LIGHT can be set to your preferred brightness, can be turned off entirely, or can be set to "breathing" mode- lighting up gradually and slowly fading down- assisting in meditation or therapeutic breathing The ultimate home relaxation device- Brings the spa to you- GREAT GIFT IDEA. It is beneficial to clean your diffuser after using with heavy oils. This will avoid oil buildup blocking the misting mechanism, and ensure that your diffuser continues providing a steady, strong mist.