I bought a standard Bluetooth transmitter with an av input, i then ran a av cable with one end where i cut the plug off and soldered the two wires into the microair radio plug as it gives you audio in just check the connection diagram, and the other end plugged into the receiver. I pair my I pad with the transmitter after which avtraffic will make announcements over your headsets, the radio will also mute when you receive a radio transmission.
Unfortunately you can only connect one devise at a time thru the bluetooth.
I also subscribed to avtraffic , but you need to open ozrunways thru avtraffic in order to hear the announcements