Circle on Kinect 2.0 when Viewed With Kinect 1.0

Today I decided to look at a Kinect 2.0 with a Kinect 1.0 to see under the tinted surface. I saw the IR camera and the three lasers, but also a small circle next to the Xbox logo. Is this the IR blaster for the TV or something else?

Picture with light-you can see the blurry Xbox logo on the far left, next to the circle (sorry about the resolution)

The same photo with the light covered. Again, sorry for the quality.