2) The mute button is always lit, its either always on red light (listening) or blinking (muted) but whenever the mic is plugged in the light is on. I am going to order another in a different color. Hard to put on and leaves gaps. Not bad for the price! But I found the sound produced by the headphone to be titled towards a balanced tone, less warmth and flat frequency response. It wasnt worth sending it back for this. 5, I would. I couldnt get my electric screwdriver to work. Girst time tmI ordered an 8. Very disappointing to have jacket but no pants.