In reply to the other one star review, the triangle in the top right is for the two sensors/LEDs in the top right.
The ones I ordered from FoneM8 however, didn't have this. On the other hand, the front screen protector does apply extremely easily, free from air bubbles and fits perfectly. As for the back protector, well, I guess I shouldn't have expected one because they were not included, which is understandable because the back isn't a screen. I shall not have such high expectations next time around.