POLAR S725 - Manual (Page 50)

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3. Start from the Time of day display by pressing the OK to start measuring
your heart rate. A heart symbol will start flashing and your heart rate in
beats per minute will appear in max. 15 seconds. The wrist unit returns
automatically to the Time of day display within 5 minutes if there is no
heart rate reception.
The following displays start to alternate, if you have no bike or altitude
settings in use, as you enter the Measuring mode:
Exercise name Memory left Bike OFF Altitude OFF
Time of day
Current
heart rate
Recording rate BasicUse (E0)/
Exercise set in use
(E1-E5) No bike in use
If you are cycling, turn the cycling settings on by pressing and holding the
down button. b1 appears in the right-hand corner of the display. If you
want to change the preset bike 1 (=b1) settings to bike 2 (=b2), press and
hold the down button again. b2 appears.