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Your set will not work normally from the mains supply, but there is now the advantage that, in case there is a mains current failure, your clock will continue to work. The clock display will not light up, as the clock time will be held in the clock memory by the battery back-up system. This enables you to move the set from place to place without resetting the clock every time. The battery back-up system is only meant to be used from short temporary power failures. For longer durations the batter