MXQ - Googlenow - Microphone USB port, possible ?

Hi guys,

Sorry if i post this at wrong box. i try to find the most appropriate box as i can

My target is using google now on my MXQ ( all black ) box.
And find some kind of microphone to record sound via usb port ? So i can active Google Now by "Ok google" right?

So anyone did it before ? Like using google now on android tv box ?
if any, anyone can have suggest one ?

Thank in advance!