This is a good addition to a Panasonic phone system. There's little that compares in hybrid phone systems, but Panasonic does a great job with all the extras, despite having virtually no competition. I bought 3 of these expansion cards and everything seems fine so far. The 3 extra CO's aren't really needed, but that's fine. Figuring out how to insert an expansion card is not very difficult. Just make sure you don't try to install the next expansion card first which contains expansions and no CO. I'm sure it won't work like that.
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