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36 Forerunner 405 Owner’s Manual
Using Accessories
How Do Heart Rate Zones
Affect Your Fitness Goals?
Knowing your heart rate zones can
help you measure and improve
your tness by understanding and
applying these principles:
Your heart rate is a good measure
of exercise intensity.
Training in certain heart rate
zones can help you improve
cardiovascular capacity and
strength.
Knowing your heart rate
zones can prevent you from
overtraining and decrease your
risk of injury.
Heart Rate Monitor
Battery
The heart rate monitor contains a
user-replaceable CR2032 battery.
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NOTE: Contact your local
waste disposal department to
properly dispose of batteries.
To replace the battery:
1. Locate the circular battery cover
on the back of the heart rate
monitor.
2. Use a coin to twist the cover
counter-clockwise so the arrow on
the cover points to OPEN.
3. Remove the cover and replace
the battery with the positive side
facing up.
NOTE: Be careful not to
damage or lose the O-ring
gasket on the cover.