By default, the BlueAnt button will flash blue at regular intervals to indicate that the Q1 is switched on. If you prefer, you can switch this light off. You might want to turn off the light if you find it distracting, for example if you are wearing the Q1 while driving at night.
When you turn the LED off, it will still light up when you turn the Q1 on and off, but not at other times.
To turn the light off or back on again, go to the "Settings Menu" and use the "LED Light" command.