BEW Aroma Diffuser and Purifier with Car Charger and USB Cable for Car Office Home (Cylinder,40ML, Silver) Work as Aromatherapy Diffuser+ Humidifier+ Air Purifier+ Ionizer, 4 in 1 to improve ambient air quality Ultrasonic diffuser runs whisper quiet for better sleeping and car driving (car charger included) 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