Just use FRS radios with some headsets and a PTT switch. VOX does not work too well as the noise usually sets it off anyway. PTT is always reliable. You can set yourself up for around $100 with two radios and headsets. Beats the high cost of the "special" comms devices, not worth it.
Chatterboxes are too expensive and they use FRS. Too many people have FRS radios nowdays and you get alot of interference. Colletts have 2 channels and can be programed to over 4000 different frequencies. Also they have a groomer warning beacon to let you know when a groomer is close by.
Of course, the other good points for the FRS setups is that you can use those at times other than snowmobiling. They aren't attached to your helmet and can be used like the "walkie-talkies" they are. I believe the Collets and Chatterboxes can only be used WITH headsets or AS headsets, but I could be wrong about that (having never owned one and all).
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