Yes, the Unite 50 built-in microphone array that has omni-directional pickup, the pickup distance is up to 12 meters, and it has a noise suppressing algorithm for excellent sound.
The Unite 150 does NOT have a microphone. The line level input on the front of the camera is passed through to the computer and can be chosen as an audio input option on the computer.
The Unite 200 does NOT have a microphone. The line level audio input on the front of the camera is embedded into the video that is streamed from the camera through the LAN port. This audio can't be utilized over the USB or HDMI outputs.