Can this be used while it is charging?
Can you be a little more specific about the “it” doing the charging? I just want to be we’re on the same page.
Can this be plugged in to 3.5 mm port on my HDTV to listen with BT headphones?
I don’t see why not.
I don’t believe so. This is a receiver with no means to transmit an audio signal.
No, you plug it into a speaker system so it can receive audio from a blue tooth capable device. …as in you cell.
I bought this and it doesn’t work well. So much so it is un-usable.