Make your car's dry air refreshing, with the use of negative ions and moderate humidification! This car humidifier is operational via ultrasonic wave to generate moist and can create negative ions.Negative-ion humidification of this best cool mist humidifier enables the air in the car to be refreshing. By humidifying and negative ion, this moist air humidifier can make nice air condition inside the car, which can help man recover from tiredness, make your long distance drive comfortable and safe. Dual-purpose household and car humidifier can product negative ions by atomization of rising water, under the principle of ultrasonic waves, and these negative irons can be uniformly distributed over the air by pneumatic devices, which can efficiently eliminate the smoke and smell in cars, prevent the occurrence of molds, improve the air quality in cars, and enhance people's living level.With full automatic function, this car humidifier will automatically stop if water is insufficient. Just make you feel more comfortable for long driving-hours!