Low Noise Sleep Better: Adopted noise reduction technology, ultrasonic diffuser operates quietly with no water dripping sounds, creates a restful and soothing environment for undisturbed relaxation, learning, working and sleeping 500ML Diffuser, Ideal for Large RoomThe covering area reaches up to 480 ft, which can use in a large room.Enjoy up to 20 hours Fragrance. Superior SafetyYou can keep this aromatherapy diffuser on at night, no need to worry about overheating because of the waterless auto-off protecting function, which assures safety for you and your family. Stylish Gift - With its minimalist design and modern optics, the aromatherapy diffuser makes a great and valuable gift for your friends and family. ;Essential Oil Diffuser features an ultra-modern marble grain design that perfectly matches any decorative style. Some essential oils can produce a healing effect that relieves your sinuses, and can help you breathe better when you use an air conditioner. You can also drop your favorite essential oil into the water as it is also the perfect perfume diffuser!