Ultrasonic Aroma Essential Oil Diffuser with Car Charger and USB Cable (Cylinder,40ML, Gold) ABS Work as Aromatherapy Diffuser+ Humidifier+ Air Purifier+ Ionizer, 4 in 1 to improve ambient air quality Elegant cylindrical design is suitable for car driving and home use Auto switch off when the water run out to ensure safety Up to 40ml capacity and 10ml/hour of moisture for 2-3 hours of output, a better try and scent of a healthier driving life Humidifier provides moisture for Dry Cough, Sinus Irritation, Dry Skin, Repel Mosquitoes, Sterilization, Mites, Endocrine and Emotional Management, Soothing Irritability, Relieving Stress