I use that intermediate one and love it. It is so simple. I just shut the other answering machine off when we are away and it answers on the fourth ring. I had another one first and it was much more complicated. We have had cause to need it too, and it worked perfectly! Called when it was supposed to. The furnace went out and so the temp went down. We have a generator so don't really need it for the power but sure is nice to know if that temp. goes down!
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