HIGH AMBIENT WORKING 52C= Keeps you cool even at a temperature as high as 52c SLEEP MODE-Ensures a comfort coolin experience by increasing the temperature by 1c per hours, then holding it sready for next five hours and finally switching of the ac PM 2.5 FILTER=Cleans air by filtering and other pollutants. FOLLOW ME=Give you quicker and targeted cooling near the remote even in a bigger room.