The blue tooth is additional cost but is built in to the PCI intercom. Once connected I played music from my phone in my pocket, the volume control is handled by the phone and the volume on the intercom only controls the helmet microphones. When i made a phone call all passengers can both hear and talk on the call. The music quality isn't as good as plugging earbuds in or having an SSV stereo but was plenty sufficient for the 4 of us. PCI also supplied a 3.5 mm male plug that you can plug a MP3 or phone into instead of the bluetooth. I tried using that also, the difference being, when plugged directly in if someone speaks either in the car or on a call, the music will nearly mute and then after a couple seconds of no talking the music comes back and on a call you can't hear the other person until 2 seconds or so after you stop talking, with the bluetooth there is no muting, If the music is to loud you need to turn it down with the device it is being played from. We all liked the bluetooth because of not having the muting . I haven't tried it yet but with an adapter i can plug the supplied 3.5 mm into my gopro and record everything that goes through there intercom on the video. I just have to get an external microphone adapter from gopro.
I wasn't able to try the car to car radio yet, hopefully some one else will have a radio on our net trip
I forgot to mention that I also got the DSP (digital speech processing) upgrade on the intercom. When the DSP is turned on it cuts out most of the repetitive noise, mainly wind noise in the microphones since we were using vented helmets it really cut down the noise.
