Best suggestion: Pull it out, check the body of the radio for a brand and model number. If it has them, search (google) for an owners manual. I do know that BT-A is Bluetooth Audio... sometimes.
This is in my work vehicle that I do not own. I don't think trying to pull this out would go over so well with my boss, but thanks for the suggestion @ThxOne. I was hoping someone would recognize the model and be able to tell me what it is.
Some of the older decks needed an add on bluetooth unit
It was a separate piece you had to buy to get it to work
MY JVC came bluetooth ready so the functions were there but with out the $100 add on it wouldn't work