As noted above the WiFi dongle still works. That will allow a remote device to control the scanner with the Siren App. That's a great help for those having vehicles not suitable for DIN mounting.
Also if you use that Siren App with an iPhone that connects to you vehicle's radio via Bluetooth, that would cause the audio to come through you vehicle's radio. (Otherwise use your basic audio cable to connect from the Line Out on the rear of the scanner to an input on the vehicle's radio.)
I've used the Bluetooth setup, but I have to give up listening to other things on the vehicle radio. So like Voyager, I use a remote amplified speaker.