Yes, yes it does have a built in mic. On the basis, the inline controller has a small hole in it?
Noise cancelling off?
Yes. You can turn it off, but you (well I did) notice a drop in sound volume of the music playing, as you are no longer isolated.
I'm half deaf, litterally, when I have anc turned off, I felt it did subdue the outside sound, but that's down to having large ear muffs covering g your ears. Obvs it's not the scale of active noise cancellation, but it does remove by design outside noise. It's often referred to as PASSIVE noise cancelling, as apposed to when using the built in ACTIVE noise cancelling.
ANC in this case, is a little white noise, like a very subtle hiss, this turned on, not only removes sound from outside the headphones, but also as a side note,.improves the listening experience with the sound inside becoming clearer and louder (to a certain degree). This is the effect of ANC, isolating you. Fighter pilots have white noise played when flying, so they can hear ground.control n each other some much more clearly, and considering the noise of the jet/turbine engine, it's bloody good.
According to the book, they last 30hrs in nluetoothode and ANC (I'm.guessing longer if no ANC).big in wired ANC mode you get 60hrs of listening.... With ANC off n wired mode, you can listen as long as you like as no energy is being used.