Sangean U4 DBT (V1) - Manual (Page 38)

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Setting the time format
The display used in standby mode and when the radio is in use
can be set to  or 4 hour format. The selected format is then also
used when setting the alarms.
. Press the Power button to switch on your radio.
. Press and release the Menu button until the Advanced menu of
the current mode shows on the display.
3. Rotate the Tuning control until 'System ' appears on the display.
Press and release the Tuning control.
4. Rotate the Tuning control until 'Time' appears on the display.
Press and release the Tuning control.
5. Rotate the Tuning control until 'Set /4 hour' appears on the
display. Press and release the Tuning control.
6. Rotate the Tuning control to select either  or 4 hour format.
The current hour format will be marked with an asterisk. Press
and release the Tuning control If the  hour clock format is chosen,
the radio will then use the  hour clock for setting of alarms,
and will display a  hour clock with an AM or PM indicator.