Moreover, the presence of batteries is an anachronism, power from a modern telephone network should be enough for a speakerphone. I have a simpler domestic phone, but with the same LCD screen, so his speakerphone works fine without any batteries and power supplies. Even when I bought it, there were still relay exchanges and a paired line, and even then it worked quite well without batteries, which it does not have. And so the extra expense of money, because the batteries have now become very expensive.
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