POLAR S610i - Manual (Page 38)

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3. Start from 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 frame around the
heart symbol indicates that the heart rate reception is coded. You have
now entered to the Measure mode.
The following displays start to alternate as you enter the Measure mode:
Exercise name
BasicUse(E0) or
Exercise set in use (E1-E5)
The receiver returns automatically to the Time of Day display within
5 minutes if there is no heart rate reception.
Memory left
Recording rate
Time of Day
Current
heart rate