POLAR S610i - Manual (Page 39)

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If you are continuing from Measure mode, press OK.
Or, if you are starting from Time of Day display, press and hold OK.
Exercise information will be stored in an exercise file only when the
stopwatch is running. The ongoing recording is indicated with a graphic
bar that runs continuously on the display.
If there is 00 / - - reading on the display, there is no heart rate reception.
Bring the wrist receiver up to your chest near the transmitter’s Polar logo.
The receiver starts looking for the heart rate signal again.
At the start of your workout, the exercise time is displayed in minutes
and seconds. When you have exercised more than 60 minutes, the
exercise time is displayed in hours and minutes.
Turning the Heart Rate Zone Alarm on/off
Press and hold the signal/light button.
When appears on the display the zone alarm is on. You will hear a
beeping sound with each heartbeat if your heartbeat is outside the heart
rate limit. If you do not want to use the zone alarm the flashing heart rate
reading indicates if your heartbeat is outside the heart rate limit. This
function can be used if you have set heart rate limits on in Interval Training
Set or BasicSet.
Exercise Recording Mode