POLAR M21 - Manual (Page 30)

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In models M51 and M52 the sound signal will also alarm
you at the end of the Fitness test.
Press and hold
for 2 seconds to turn the sound
signal and the button sound on and off.
Sound signal is on.
A flashing heart rate reading also informs you of
being outside your target zone.
The sound signal setting is saved i.e. the next time
you start heart rate measurement the previous
setting will be used.
S W A P T H E U S E R
In models M51 and M52 you can swap the user in the
beginning of an exercise when the stopwatch is not
running yet.
To be able to swap the user you need to set preferences for
two users.
Press and hold SCROLL UP.
or is displayed to indicate which one of the
user settings are activated.
The following exercise will be recorded in the selected
user’s file.
S T A R T / S T O P T H E S T O P W A T C H
Press START/STOP/OK to start/stop the stopwatch.
Exercise information will be stored in an exercise file
only when the stopwatch is running.
You can pause the stopwatch by pressing START/STOP/OK.
Repressing it will restart the stopwatch and the above
calculations.
M52 man USA GBR A 2001 10/12/01, 12:46 31