My wife and I have been shopping around for a good deal on a Voice activated two way radio system for the 400. The "chatterbox" systems are nice, but very pricey for us, so we've been looking to see what might work instead. Today, we finally settled on a pair of VOX radios from Audiovox that we found at Walmart for $39. It included the radios, rechargable AAA batteries for both, a charger base, AC adapter, cigarette lighter adapter, 2 boom mic headsets, belt clips and cases for the units. It works great. We had to change out the ear pads on the headsets (they were the cheap foam covers that do nothing for comfort) but we happened to have several molded rubber covers from our hands free cell phone mics that fit over it (with a little work) and now they fit very nicely, with a tight enough fit to block wind. We also had to snip off the "over the ear" attachments, because the pads in the helmets were making them dig in. Once all that was done, though, they're just what we wanted. The molded ear piece is comfortable, the pads hold it all in place, the boom mic runs right along the jawline and the chin strap holds the mic right up to the mouth for easy reception. I just drop the radio into my inside pocket of my armored jacket and run the cord up out the neck. The charger fits in the glovebox with the radios in it to recharge while we drive on long trips if the batteries die. You gotta put rubber bands around the base and the radios to hold them together while it's on it's side, but no problem for me. All in all, it's what we needed for a great price.