![](/images/new-backgrounds/1302666/30266639x1.webp)
OPERATING THE WATCH
OPERATING HEART RATE/CHRONOGRAPH MODE
The Sportline Duo 1010 Heart Rate Watch is equipped with a
symbol | what it means |
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| Heart Rate is below selected |
| Target Zone |
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| Heart Rate is above selected |
| Target Zone |
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| Heart Rate is in selected Target Zone |
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| Maximum Heart Rate for workout |
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| Average Heart Rate for workout |
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symbol | what it means |
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| Heart Rate is being detected |
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| Heart Rate as a percentage of |
| calculated Maximum Heart Rate |
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| Hourly Chime is activated |
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| Daily Alarm is activated |
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| Low Battery warning |
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