I have been using the MOTOComm Audioboss for about the last six months. I highly recommend it. It works excellent as both an intercom (driver/passnger) and as a bike to bike communicator. To use it bike-to-bike you have to have a set of two way radios. You can also plug in your cell phone, and an mp3 player. The unit has a built in FM reciever if you just want radio. The unit runs on 2-AA batteries, but so far I have only had to change the batteries once (in six months), and that is with pretty heavy usage. The intercom is duplex communication (like talking on a phone), and the bike-to-bike communicator uses a handlebar mounted push-to-talk button to activate the two way radios. I've found this works better than the VOX feature on a lot of communicators (no wind noise to interfere, and run down battery). If both riders have passengers, all four people can communicate. The unit comes with two PTT buttons so the passenger has their own. When anyone presses the PTT button, both drivers and passengers can hear the conversation. My brother and I have used the bike-to-bike communication a lot. It makes rides a lot more fun. We haven't had any problems with communicating at 80+mph freeway speeds and we can be about 2 miles apart in most cases. The only complaint is that there are a lot of cords. It isn't a problem if you have a tank bag, or wear a fanny pack, but otherwise the cords can get a bit unruly.