POLAR S720i - Manual (Page 48)

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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 receiver 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 Measure 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