Expand Boom Compatibility

The product information for the Expand Boom is far from clear on this!
I am going on a trip. My friends will be using the Sena 50C and 20EVO devices. I will be in my Jeep, and would like to be on their intercom without having to wear my motorcycle helmet!
1) Will the Expand Boom device pair with the existing Sena 50C, 20S, 20EVO, etc devices? Can it participate in the intercom? I realize this may only support 4 way.
2) What is the difference between the Expand Boom, the Expand, and the SPH10? Which is the newest technology?
Is this the best way to go? Do you recommend a different device?


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