I use Rugged radios in my class 10 desert car. Its retired from racing and is now my overbuilt desert play car. Curently have mounted intercoms and radio. Pair of r1 hand held radios. Helmet air pump, helmets wired for headset and nice pair of ear muffs. My r1s have the larger batteries and also the extended antenas. Everything works perfect. Passenger to driver comunication is crystal clear. No buttons to press just simply talk. I carry the hand helds for when other people are riding with me so we can comunicate. Those radios are also crystal clear. Nice job Rugged. Massive amounts of dust and crazy bumps and jumps year after year and everything still works perfect.