Garmin forerunner 405 Owner's Manual page 40

Using Accessories
can help you measure and improve
your fitness 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.
note: Contact your local
waste disposal department to
properly dispose of batteries.
4
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.
4. Use a coin to twist the cover
clockwise so the arrow on the
cover points to CLOSE.
Forerunner 405 Owner's Manual