A:AnswerNo, they are always on when the headset is plugged in. There is an extra red LED that illuminates under the bright blue LEDs when the Microphone is muted, but it isn't easy to see and the bright blue LEDs on the control box make it harder to see what each of the black buttons actually are for.
A:AnswerThis headphone has a slight noise cancelling effect. If you are trying to block out a significant amount of outside noise this is probably not the headphone for you.
A:AnswerHonestly, I am not sure as they fit pretty tightly. They might be uncomfortable with your hearing aids in. I would look for a pair with a bit of a looser fit.