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2.4. HEART RATE MONITOR AND TRANSMITTER BELT
2.4.1. Activating the heart rate monitor
To activate the heart rate monitor:
1. Attach the transmitter to the elastic strap.
2. Adjust the strap length to fit snugly and comfortably. Secure the strap around your
chest, below the chest muscles. Lock the buckle.
3. Raise the transmitter a little off your chest and carefully wet the grooved electrode
areas on the backside.
4. Check that the wet electrode areas are firmly against your skin and the logo is in a
central upright position.
5. Wear the Suunto X3HR as you would wear an ordinary watch.
NOTE: You should wear the transmitter against your bare skin to ensure flawless
operation. However, if you wish to wear the transmitter over a shirt, moisten the shirt
well under the electrodes.
2.4.2. Electromagnetic interference
Disturbances may occur near high voltage power lines, traffic lights, overhead lines of
electric railways, electric bus lines or trams, televisions, car motors, bike computers,
some motor driven exercise equipment, cellular phones or when you walk through
electric security gates.
2.4.3. Warnings
Persons who have a pacemaker, defibrillator, or other implanted electronic device use
the heart rate monitor at their own risk and it is recommended they undergo an exer-
cise test under a doctor's supervision before using the heart rate monitor for the first
