Just add tap water and essential oils Extremely quiet and easy to clean Cool steam / no heat involved / no risk of burns Automatically shuts off Runs 4 to 6 hours NOW® Solutions Ultrasonic Oil Diffuser unites scientific innovation with contemporary design to create an essential oil diffuser that's the perfect complement to your home or office. This attractive diffuser is BPA-free and utilizes high-frequency ultrasonic electrical vibrations to create an ultra-fine aromatherapy mist. This diffusion method doesn't utilize heat, which maintains essential oil integrity and holistic properties. It's perfect for daily and year-round use and is a healthy alternative to synthetic room fresheners and scented candles. Specifications:Color: White cover and baseLED Lights: 6 Changing Color Lights: Blue, Green, Purple & RedModes Misting: On/OffModes Light: Off or rotating lights or stop on one colorCapacity: 140 mg/4.7 fl. oz.Run Time: 4 to 6 hoursCoverage: Up to 250 square feetVoltage: 120 VProduct of China NOW Ultrasonic Essential Oil Diffuser Instruction Manual NOW Diffuser Limited Warranty