<<<...so i guess it is in fast mode...>>> And when you press and hold the button again it will be in slow mode.
The way to tell which speed without guessing, is to look on the controller right above the 'MODE 2'. It will say 'LOW' or 'HIGH'. It also beeps once for slow speed and twice for fast when it changes, but I am so old I may not hear it so I just look at the controller when I want to know.