Omron HR-500U Instruction Manual page 18

Pausing a workout
1. Press the ENTER button.
Measurement will pause. While paused, the
unit will alternately show "PAUSE" and the
display screen. (Only the heart rate and clock
will be updated.)
Resuming a workout
1. Press the ENTER button.
The "PAUSE" display will disappear, and measurement will resume.
Ending a workout
1. Press and hold the ENTER button for
3 seconds.
After "STOP" is shown, the current time will be
displayed.
WORKOUT MODE
18