Two radios, two helmet mounts, two chargers. All you need for two people to chat for the whole ride. I like that two motorcycles working together can help each other out. If one person's further into a curve they can radio back, "Nobody coming -- good time to pass." Or if two bikes want to coordinate changing lanes when there isn't a single large gap, the front bike can merge then slow down giving the second bike room to slide in. Or of course you can just gossip... or argue over where to have lunch... or call out your location when you've been separated... or sing songs. These aren't Cardo's current models but they work great. These are 1/6 the price. And how often do you really want to talk to 14 other riders at once? These work on Bluetooth but somehow get long range. Cardo claimed a mile but I think that's only under perfect conditions. I'd count on half that. These are the 'wired mike' models which mean they're for non-opening full-face helmets. I can provide sticky velcro but you'll maybe need to cut some little styrofoam blocks for earpiece and microphone positioning. That depends on you and your helmet. I'm happy to talk you through installation. The link below is to the original manufacturer's manual.