I bought my first R7 from BRD when it came out and the serial # is at 2000's. I have posted a lot of real life videos with it and its pretty good with range and all. I recently bought another R7 for testing purpose and it came with the serial # 3000's range. Its extremely quiet and I'm running the same setting with same FW. Not sure if I got the cold one. Only ka band alert I got from the newest radar is 33.8 and it was just for a sec. No cops to be seen anywhere on I-75. I'll keep it for a few more days for testing and then send it back.