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How to change the clock display to 12hr. mode or 24hr. mode (military time)?

1. Press and hold (Time Set button) until "SYNC" or "MANUAL" flashes in the display.
2. Press and release (+ or - button) to select manual.
3. Press and release (Time Set button) time will flash in the display.
4. Press and release (Alarm button) to select 12 or 24 hour display. Press Time-Set button again (or no button within 10 seconds) and the settings are automatically saved.