Dozens of models to choose from. All questions on Fixya need 'make model (what it is)' as the first 3 words.
Here are some guesses. The 'control cover' is where you put the back-up battery.
To change the 12/24 hour time format, open the CONTROL COMPARTMENT COVER on the bottom of the clock and adjust the 12/24 TIME FORMAT switch to the desired format .
Instruction Manual - Brookstone
Brookstone
https://manuals.brookstone.com > ...
PDF
12/24 HOURS TIME DISPLAY SETTING 1. The "12h" or "24h" will start flashing in LCD2 (Default setting 12h).
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Setting The 12/24 Time Format; Setting The Daylight Savings ...
ManualsLib
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Brookstone TIMESMART Self-Setting Clock Radio Manual Online: setting the 12/24 time format, Setting The Daylight Savings Time. The 12 Hour Format Is Set As ...
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