Smart Air Quality Sensor & Auto Mode-Trustech Air cleaner is able to continuously diagnose your air quality, display the air quality level (blue, green, purple, red) on the control panel, and then automatically adjust the fan speed in response to real-time air quality, saving 90% energy for you. Efficient Filtration System?-Air purifiers for home can remove 99. 97% of dust, pollen, smoke, household odor & pet dander, even useful for particle as small as 0. 3 microns, and larger air pollution of PM 2. 5. Ideal for people with allergies, asthma, low immunity and stuffy nose. High Performance & 100% Ozone Free-Just need 10 minutes to refresh the air of 215 sq. ft. room,120 M/H CADR.100% ozone free, making sure it is safe for you and your family. Air purifier for bedroom provide you with a better and healthier living environment. Sleep Mode & Night Light- The lowest noise level of true HEPA air purifier as quiet as 20 dB at the sleep mode,4 colors night light design helps you sleep better, you can turn the light on or off depending on your sleeping preferences. Sleep/Mid/High 3 fan speeds efficiently provide clean & fresh air into every corner of the room.