Thanks Machmech,
Looks like it is battery powered, although a 20 year life is very impressive. It sounded, above, like it was powered by the water flow.
rt
While I realize the original question was off the forum topic, somewhere in the thread is the comment about:
RF power meters do that, generate power from water flow
are those RF power meters or rf water meters, i.e. is this an application of automatic meter reading? If you can point me to a...