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 Room:The covering area reaches up to 480 ft², which can use in a large room.Enjoy up to 20 hours Fragrance. Superior Safety:You 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