SET TING AND OPERATING
SETTING TARGET HEART RATE ZONE
Activation: from the Stopwatch/Heart Rate screen by pressing and holding the SET key for 2 seconds.
: Press and HOLD key 
: Press and RELEASE key
Enter set target zone | Adjust lower heart rate limit | Adjust upper heart rate limit |
Press and hold SET key to enter | Press SET key to advance | Press SET key to advance |
| Press START/STOP key to reverse | Press START/STOP key to reverse |
| Press MODE key to set | Press MODE key to set |
| Hold for fast advance | Hold for fast advance |
THe LifeSource XC300 Heart Rate Monitor is capable of being programmed with a Target Heart Rate Zone in one beat per minute increments. This feature allows you to carefully define the intensity at which you wish to train.
1.The Stopwatch must be stopped and cleared to zero before programming the Target Heart Rate Zone.
2.Once you have set a Target Zone and the Stopwatch is running, your monitor will automatically track the amount of time that your heart rate is in the “zone” as well as alert you visually and audibly if you are outside the zone. (The Calorie Counter starts and stops at the same time as the Stopwatch. Please see page 15 on how to activate the out of Target Zone alarm.)
3.When you are setting the Heart Rate Target Zone, the SET key increases the setting while the START/STOP key decreases it. When setting the upper limit, the setting process will automatically stop once the upper limit is with- in 2 beats of the lower limit. When setting the lower limit, the watch will automatically increase the upper limit, maintaining a 2 beat gap.
Please see page 6 in the Workout Guide to determine your Target Heart Rate Zone.
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SETTING AND OPERATING
ACTIVATING THE OUT OF HEART RATE TARGET ZONE AUDIBLE ALARM
The LifeSource XC300 Heart Rate Monitor is equipped with a Zone Alarm that tells you if you are outside of your chosen target heart rate zone. The Zone Alarm is acti- vated and deactivated by pressing and holding the ALARM key for two seconds.
When the Zone Alarm is activated a small alarm tone icon 
will appear.
If you are below your Target Zone, the alarm will sound with a single beep. If you are above your Target Zone, the alarm will sound with a double beep. The alarm will sound approximately every six seconds.
Press and hold ALARM key to
activate and deactivate zone alarm
TARGET ZONE VISUAL ALARM
The LifeSource XC300 Heart Rate Monitor is also equipped with a Visual Alarm to tell you if you are outside of your chosen target heart rate zone. Two small
arrows at the left of the display 
show if you are above or below your target zone. Also, if you are outside of your Target Zone, the heart rate number on the display will flash. The Visual Alarm is automatic and cannot be disabled.
VIEW TIME IN TARGET ZONE
Once you have programmed a Target Heart Rate Zone and started the Stopwatch, you can keep
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