Product features - UV bacteriostasis /Three layers filter / anion purification/ cup design /intelligent control/digital display. UV effective clean from source - Led-uvc uv shortwave does not hurt people, people can be present when the UV function is turned on. Purification & - Combining prevention with thorough purification, Ultraviolet bacteriostasis/High efficiency filtration/Anion purification. Three color light Air quality at a glance: Green-Good air quality, Red-Poor air quality, Orange-Air quality is average. Real-time digital display of in-car air quality - Built-in air quality sensor through the digital display of air quality.