BPA Free4 Hours Run TimeColor RotatingUp to 400 Sq. Ft Features Extremely QuietEasy to CleanJust Add Tap Water and  Essential OilsCool SteamNo Heat Involved/No Risk of BurnsAutomatically Shuts OffBPA-FreeRuns up to 4 HrsGreat for Home or Office 1 Year WarrantyRun Life 5,000 + HoursPlugs Into Laptop or Any USB PortRotating LED Lights Specifications Model: 7523 Color : White Cover and Base Misting Modes: Continuous/Off Light Modes: Color Rotating/Off Run Time: Up to 4 hours Water Capacity: 70 ml/2.37 fl. oz. Coverage : Up to 400 sq. ft. Power: 5W ± 0.5W  Dimensions : 4"l x 4"w x 5"h Ultrasonic USB Oil Diffuser NOW® Solutions Ultrasonic USB 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 four hours of whisper-quiet operation, this attractive diffuser complements your healthy lifestyle and is ideal for home and office. More About Aromatherapy Aromatherapy and essential oils have been used throughout the ages. Incense, ointments and oils were all made from plants by holistic practitioners. Aromatherapy is one of our oldest, non-invasive health practices. Scents have an effect on our mind and body; they can evoke memories, stimulate feelings and arouse the senses. Certain essential oils have the ability to relax, stimulate, or create balance between the body and mind. An essential oil's aroma is picked up by the olfactory nerve located in the back of our nose and then carried to the brain where it can have an effect on the senses. Scents can stimulate an emotional response due to their direct impact on the limbic system, which processes our memories, emotions and feelings. At NOW® Solutions, we take the quality and purity of our essential oils very seriously. We go to great lengths to ensure that every oil we produce is brought to you in a manner that's both scientifically and environmentally responsible.