LifeSpan TR3000i Owner's Manual page 42

Operations
Chest Strap
All three of the treadmill models covered in this Owner's Manual have integrated
bluetooth heart rate receivers built into the console. To purchase a heart rate
chest strap, or arm band go to www.LifeSpanFitness.com.
The chest strap should be worn as shown.
When using a chest strap you may need to
warm-up first to increase the moisture in your
skin. If this doesn't work, use aloe or another
moisturizer where the sensors on the chest
strap are making contact with your skin.
NOTE: The heart rate monitoring system will vary due to your age,
method of use, physiology and other factors. LifeSpan cannot guarantee
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the accuracy of the heart rate readings.