RR
If she already has DMS unit, you only need different speakers and an extension cord to use her modular DMS on a BV2S helmet.
We do not expect a lot of interference from outside sources. The Bluetooth is a low output power transmitter, but would be effected by a microwave oven nearby. It is limited to about 10 feet of operating range, so it's receiver is not very sensitive.
The radio will cut out transmission/reception when the phone rings. Unless you are using your phone through a Zumo or TomTom GPS, you do not have to change the channel, or activate the private mode. This is because the GPS's are using an old Bluetooth protocol and do not support streaming stereo, or the new A2DP protocol.
The cell phone cuts everything out, radio (or passenger) transmission/reception cuts out music from either Bluetooth or direct plug in.
The Bluetooth will use more power than the standard plug in, but we are still seeing over 6 hours when using streaming audio.
The Bluetooth will be back in full production by the end of next week.
GTSE, the Collett radios do not work with the Chatterbox units. We are on 900 MHz, where the Chatterbox are on the FRS frequencies in the 450 MHz range.
I've been using a Samsung M610 phone with excellent results. It has a built in MP3 and streaming stereo, as well as the phone. This is an excellent phone for both purposes.
If you have any more questions, feel free to ask!
Ryan