In order to determine the mode of the device operation at the given moment, it is sufficient to take a look at the button of switching the modes (2).
If the button (2) is not glowing, it means that the device is operating in the first mode (Photo 2).
If the button (2) is glowing, the device is operating in the second mode (Photo 4).
If the button (2) is blinking, the device is operating in the third mode. Also, in the third mode, blinking inside the device is visible.