Cameras with HDMI outputs do also send an audio signal from the onboard mic, however, it's not usually great. This means that you'll probably want to get an external microphone--we like dynamic microphones for live streaming because of their excellent noise rejection, meaning you'll hear fewer keyboard sounds and more voice. While there are some mics we like that connect via USB, we actually prefer connecting an XLR microphone to a dedicated audio interface for your stream setup. You'll usually get better audio quality and more control over your mic during your stream as well as low latency.