3 or 4 infrared sensores?

[andrelmg1989]

Just saw that my droid turbo seems to have 3 sensors around the screen, not 4. Anyone can confirm that? 2 in the bottom, one in each side, and one up, in the right side. In a dark room, you can see them if you let screen lock and come with your hands slowly by the sides.
So, 3 or 4?

 

[bradenfontaine]

I have 3 as well