1,Fan speed regulator; 2,Hi,Mid,Low,3 speed levels; 3,Working distance:more ... set at HI, MID, and LOW using 3 speed control keys, and the LCD display will show“ ”indicator rotating at HI, MID ... .The fan can be timed using “Timer” key with a delay of 1, 2, 4, and 8 hours (or other custom settings ... ), and the LCD display will show countdown time.No ...