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That is a board replacement Comfort II substiture for Comfort I
There are upgrade packages which make it more atttractive. You should check with the distributor
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We have carried out a number of board changes now..
If your Comfort unit is tidy and not crowded its a relatively straight forward job. If comfort is a birds nest its a re-wire..
Your existing .ccl file will convert to .cclx IF you have it! Go care full of the modules as they dont appear to convert very well (there is a pop up window to tell you).
You will need a new ringer module if you have a doorphone.