[rohrmann]

Our rig is five years old, and we have had to replace all three detectors. The last to fail, the smoke detector, I replaced with one with a 10 year battery, and when it gets to it's end of life, you just replace it. Even though these detectors are supposed to last a certain number of years, you have no idea what chemicals they have been exposed to, and how that will shorten there life. Our CO detector didn't even make it two years. The next to fail, a little over two years ago, was the propane detector, which just started screeching very loud in the middle of the night. The only thing I could do, half asleep, was to grab my pocket knife and cut the hot wire to stop it. The smoke detector I replaced earlier this year when it started acting weird, again in the middle of the night and we had a grand-daughter staying with us who was scared to death from the noise it made.