Before revision: The key pad is marked with secondary functions and is also used for operating other functions of the watch such as operating the stopwatch, turning the alarm on and off and switching from am to pm in time setting mode.
After revision: The key pad is marked with secondary functions and is also used for operating other functions of the watch such as operating the stopwatch, turning the alarm on and off and switching from anti-meridian (am) to post-meridian (pm) in time setting mode.