I've been using this for nearly two years.

https://www.amazon.com/dp/B00O8FYUJA/ref=cm_sw_r_other_apa_vOpNyb98YJHJ9

Lets me mount my phone on the windshield and use BT to the adapter that connects to my old ass radio. It's been flawless.

I bought a similar thing to this (not this model exactly, but this one, which is 3.0) and it runs on a battery. I'm not quite sure what you're looking for, however if you want a battery-run bluetooth receiver, yours looks good.