更新1:
Thanks Anthony. I don't know what's it called but the car itself has the bluetooth function to connect my phone, I can talk freely in the car so there must be a mic, just didn't know whether I need any hardware installed to get it working.
更新2:
That's the thing, I have the button on the steering wheel and I also have navigation (GPS), but I tried pressing the button or go into system options, there isn't a voice control available.