Fast cooling mode starts immediately with the push of a buttion. According to preference, air direciton can be changed freely and Effectively catches floating PM 2.5 particles to maintian clena air in the room. Electronic static material removes PM 2.5 from the air and abscorbs it when passing through the filter. A highly efficient DC motor drives the fan of the indoor unit. Efficiency is much higher than an equivalent AC motor. The function permits automatic return to previous operation after a sudden power blackout High performance grooved piping is used in heat exchangers to increase the heat exchange area This AC has a blue epoxy coating on the evaporator fins of the indoor unit. This restricts the accumulation of condensed water and dust particles which significantly improves the cooling performance of this AC Backlight button is pressed, the setting can be easily checked in the dark 24 Degree Default Setting