I was reading the steering wheel controls thread..WOW. Anyway I have a 09 LS I just got and wondered

1) If the volume/mute controls can be added(I assume yes)
2) If the cover for this is silver like the blank?
3) If the Bluetooth will work. I really am behind on technology anyway. So I don't really know how they work. I assume it links to a smart phone and you can hit the button and answer the phone? I'm plenty talented mechanically just not up on modern phones.

 

The best place to look is in the thread you referenced, it is terribly long, but ALL radio control questions have been addressed in it.

BlueTooth depends on your radio, if it has it then it is telephone only. Directions will be in your Owner Manual available here: https://www.chevyhhr.net/forums/general-hhr-4/online-owners-manual-3074/.

Best policy is to post in a relevant thread, AFTER you read it. Rather than starting new threads.