The control of the fan speed through the key has not been possible. When the button is pressed, rather than changing the speed display, the fan turned but continue just as quickly. The hope of finding a solution to the manual, vanished very quickly, because it is written entirely in Chinese. The plug-in connections, especially the 4-pin power connector are so badly processed that the pins are wrong and infecting the patient exercise. Taking during operation from a fan, you will hear a deafening beeping, which although then can be shut off by pressing the button again, but not permanently disable.
Actually, I'm to blame, to buy a fan controller with display for this price. It has been a reason why reputable manufacturers of this type usually begin product more than twice;)
