G2 II

Yes, it does. The mic is detachable so you can take the mic off.

There is a microphone switch on the in-line controller. When the mic is on, the indicator light is on.

Yes, it does. This gaming headset is compatible with Mac devices; but 7.1 surround sound software is not applicable on Mac devices, it is only applicable on Windows 7/8/10 devices.

No, it won't work with Xbox devices.