[Twox48]

I am just getting back into sledding and I am going to try to get my wife into it as well. In order to make her feel safer, I want to have a helmet communication system between us. She will have her own machine. We have friends who ride and would like a system that they can also be added to.
I don't want to spend tons but I do want a system that has decent range and relatively easy to use. Other things that I would like but are not mandatory are: voice activation, blue tooth, long battery life.
So what are people using and what are the pros and cons?
Thanks in advance!