Portable Cars: If you have been sitting in an enclosed space for a long time, you will know the importance of getting some fresh air circulation. Clean air is not suitable for the home, so we include a 12-volt DC car adapter so you can clean the air wherever you go.Silent Operation: Sitting on the bed at night while listening to the loud sound of the air purifier? Never again! Sleep mode has a maximum operating noise of only 22 decibels and is therefore even quieter than a secret .Smart Air Quality Sensor: This air purifier has a smart air quality sensor with three-color light to show the air quality of your life. Green indicates good air, yellow indicates moderate air, and red indicates air damage.Seven-stage Filtering: The 7-in-1 real HEPA filter helps you breathe easily by removing particles as small as 0.1 micron. Human hair is approximately 50 microns in diameter, so our filter removes particles 500 times smaller than human hair.Specifications:Item name: Small Air PurifierPurification method: 3 composite filterFilter life: normal use 3-6 monthsPower: DC 5V / 1A USBPower: 3.5WSize: about 70 x 150mm/2.76*5.91inMaterial: ABSAir volume: 3 levelsFilter element: H13Packing List: Air Purifier * 1 USB * 1 Manual * 1