Polar Electro F6 User Manual page 14

In Zone (displayed if HR limits is on)
symbol is displayed if your OwnZone determination succeeds
Exercise duration between target heart rate limits
Target heart rate limits as bpm or as %HR , depending on your settings
max
The symbol moves left or right according to your heart rate. If the symbol is not visible,
it means your heart rate is either below or above your target heart rate limits. The alarm
sounds, provided the zone alarm is switched on.
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