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"Optima plus" is a model. It was a 4-zone on-board keypad model.
There is also an "Optima 2 plus" which can also be a 4-zone on-board keypad model, but also a 4-zone and 8-zone blank end-station and remote keypad.

In all cases, it clearly says the model on the keyboard.

Graham
February 2010

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