There are PC-connected tethered VR headsets (HTC Vive, Oculus Rift on the left) and ones that work with smartphones (Google Daydream View, Samsung Gear VR, right). Oculus Go is in the middle: It has a similar headset design to Rift, but the function of Gear VR.
The included controller has a trigger, a clickable touchpad and two top buttons.. but no volume control (that's on the headset). It has motion controls for pointing and twisting the controller, like Apple TV or a Nintendo Switch Joy-Con.
I connected with west coast colleague Sean Hollister in Oculus Rooms, a social meeting zone with a TV for viewing Facebook videos and a game table. The chat sounds good with the included speakers and microphones.