PRAGMATIC COMMUNICATIONS SYSTEMS CATS-KP, Руководство пользователя

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The keypad’s LCD is, by default, automatically adjusted to provide the optimum contrast.
However, users can change the contrast manually in fine (buttons [1] and [2]) and coarse steps
(buttons [3] and [4]).
Adjusted contrast is not stored in the non-volatile memory and will be reset to the default value
should a power cut occur.