POLAR S720i - Manual (Page 60)

C 58
Recovery calculation
One of the following is displayed depending on your settings:
A. time-based recovery calculation or B. heart- rate-based
recovery calculation or C. distance-based recovery calculation.
A. Time-based recovery.
Recovery countdown timer.
Current heart rate.
Or
B. Heart-rate-based recovery.
The difference between the preset recovery heart rate and
current heart rate.
Current heart rate.
Or
C. Distance-based recovery.
Recovery countdown distance.
Current heart rate.
You will hear two beeps when the recovery calculation is
done.
At the end of recovery
A. and B.
Or C.
Recovery duration. Recovery distance.
Drop in your heart rate.