What is on top of the Galaxy S6? (PIC)

Dang the headphone jack must really be moving to the bottom. Bummer. Always thought that was a strange design on the iPhones.

The smaller hole looks like a noise cancelling mic, but the bigger hole I'm not sure. IR blaster on my S5 is not opaque like whatever that thing is.
 
Ir blaster. I use it to prank the teachers at school by turning on and off the tv air con and projectors.