Buy a new one for $15 and get the manual. :>D
This link gives the button functions.
https://www.aliexpress.com/item/32779408249.html
Dawn Soriano. Top right button for 12/24 hour. Probably 'press and hold'.
12/24 HOUR FORMAT SELECTABLE (PRESS C)
Alarm Mode
ALARM MODE: PRESS "B" KEY ONCE TO ENTER TO ALARM MODE, PRESS "C" KEY TO SELECT CHIME/ALARM. PRESS "D" KEY TO FLASH HOUR. PRESS "C" KEY TO ADJUST. WILL FLASH MINUTES. PRESS "C" KEY TO ADJUST MINUTES. PRESS "D" KEY TO SET. PRESS "B" KEY TO RETURN TO MAIN SCREEN WHEN AN ALARM SOUNDS, PRESS THE "B" KEY TO STOP THE ALARM AND START SNOOZE FUNCTION. IT WILL ALARM AGAIN AFTER 5 MINUTES. PRESS THE "C" OR "D" KEY TO STOP THE ALARM. ALARM WILL STOP AUTOMATCALLY AFTER 20 SECONDS ? TO HAVE YOUR WATCH SOUND AT EVERY HOUR, PRESS "B" KEY ONCE. PRESS "C" KEY TILL ALARM BELL APPEARS. TO DISARM, PRESS "C" KEY TILL THE BELL IS BLANK.
https://www.dxl.com/media/content/pdf/98776_instructions.pdf
https://www.google.com/search?q=smael+dual+time+watch+instructions
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