Portable 2-in-1 Mini Ultrasonic Car Air Humidifier Air Purifier and Aroma Diffuser Essential Oil Diffuser for Car (Green) Best In-Car Air Humidifier. High Quality, Portable 2-in-1 Mini Ultrasonic Car Air Humidifier and Aroma Diffuser / Essential Oil Diffuser for Car. 2-in-1 Car Air Humidifier and Aroma Diffuser is proven to help alleviate symptoms of a variety of bothersome health conditions. It offers a relief from dry air, cold, flu, cracked skin specially during the winter/cold season. Works best with water soluble essential oils and gives off pleasant aroma to help lift your mood, relieve tension and anxiety, and improves concentration while driving. It plugs into the car's cigarette lighter socket and allows 180 degree rotation so you can enjoy your humidifier or diffuser just the way you like it. Ultra compact and lightweight, this diffuser won't take up any extra space like other bulkier diffusers on the market and it is also easy to store. It allows up to 2 hours of continuous use with 50ML water tank capacity and shuts off automatically once it runs out of water.