Wondering if anybody has experience with this system? Also, what is the life span of the units? Found these off a former "passed" survivalist estate, with no information. Long story, but he was good.....left lots of treasures for his Mrs. My wife asked me about an old pipe in the basement she was going to dispose of... and that his wife thought he might have cash in it. I told her that might be the case, old silver or gold possibly.... sure enough, the thing was packed with silver. His wife was a happy gal to have "found" that treasure. Anyways, wanted to see what folks might know about this system.