-3-stage purification includes a pre-filter H13 HEPA filter and activated carbon filter -Large purification area reaches up to 1300 sq.ft per hour -Effectively removes 99.99% of particles as small as 0.1 microns -Smart touch panel and 4 adjustable fan speeds for easy operation -3-color air quality indicator lets you know the current air quality in time -The 2/4/6/8H timer allows you to set the auto shut-off time freely -Child lock function prevents kids from playing with the settings -360° air