Need help clarifying small questions

[android jack]

There were somethings I noticed that weren't discussed in the books, videos and Google is leading me nowhere. Two things I need clarified:
1) there is a small bar between front camera and top speaker
2) there is a hole on the top black bar between the two rear cameras above the flash

Sent from my HTC6525LVW using AC Forums mobile app

 

[ironbesterer]

Proximity sensor and microphone on the back.

Sent from my HTC6525LVW using Tapatalk