Great Room Essential Oil Diffuser, 500ml Aroma Diffuser, 7 Color Variations green Low Noise and Better Sleep: With noise reduction technology, the ultrasonic diffuser operates quietly without dripping sound, creating a quiet and soothing environment for relaxation, study, work and sleep 500ml Large Room Diffuser: Covers up to 480 square feet and can be used in large rooms. Enjoy the aroma for up to 20 hours. Three settings are available: 1/3/6H timer. SUPERIOR SAFETY: You can use this aromatherapy diffuser at night without worrying about overheating because the water-free automatic shut-off feature keeps you and your family safe. STYLISH GIFT - With its minimalist design and modern optical design, this aromatherapy diffuser is a safe and valuable gift for friends and family. The essential oil diffuser features an ultra-modern marble design that perfectly complements any decor. Some essential oils can be therapeutic, soothe your sinuses and help you breathe better while using the air conditioner. You can also put your favorite essential oils in the water as it is the perfect fragrance diffuser too!