Lentenda Auto Mini USB Home Room Humidifier Air Purifier Freshener Travel Car Portable (brown) Capacity: 180ml.Wo-level humidification. For Daily use,comfortable,healthy and convenient. It is suitable to be used in your bedroom,office room and car.Special design to make the machine work stable in the car. Automatic low water level protecting function.Three power supply method: AC/DC adaptor,USB cable,car adaptor. This device may be used with essential oil;but essential oil must be water soluble and you may drop at most 6 drops of such oil into water each time.