[WindowsCentral.com]

Cortana is available on Xbox One, bringing natural language commands to the console, but she comes with some specific hardware requirements.
As specified by Microsoft, to use Cortana on Xbox One you either need to have a Kinect or a headset microphone.
As much as I love Kinect, it can be expensive to purchase as a standalone device, particularly since it's no longer in production. Since the new Xbox One S comes with an IR blaster built in, you may find yourself even less likely to want a Kinect unit. Additionally, if you have invested in a dedicated sound system, donning a headset just for Cortana might seem a little counter-intuitive and silly.
Related: Is Kinect still worth buying in 2018?

But if you have the revised Xbox One controller with a built-in 3.5mm headset jack, there's an easy and cheap method for activating Cortana voice commands on Xbox One.

Full story from the WindowsCentral blog...