La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 37

1. After setting time reception ON/OFF, press the SET key, "12h" or "24h"
flashes in the LCD. (default: 24 h)
2. Press the + key to select the "12h" or "24h" display mode.
3. Press the SET again to confirm and to enter the "Manual Time setting" or
exit the setting mode by pressing the CH key.
Note: When 24h mode display is selected, the calendar format will be date and
month display. When 12h mode display is selected, the calendar format will
be month and date display.
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