When you buy this launcher, please note that there is a transmitter with the same appearance of the timer function, and this is a reverse function, the two transmitters need to correspond to different receivers, otherwise the timing and reverse function will not be available.
There are 4 buttons (HI,MED,LOW,OFF) to control the speed of the fan and off.
The red indicator on the transmitter will light when one of the 5 buttons is pressed.