Product Info
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OPTICAL HEART RATE
Optical heart rate measurement from the wrist is an easy and convenient way to
track your heart rate. To get the best results, please keep in mind factors that may
aect heart rate measurement:
• The watch must be worn directly against your skin. No clothing, however thin, can
be between the sensor and your skin.
• The watch may need to be higher on your arm than where watches are normally
worn. The sensor reads blood flow through tissue. The more tissue it can read,
the better.
• Arm movements and flexing muscles, such as gripping a tennis racket, can
change the accuracy of the sensor readings.
• When your heart rate is low, the sensor may not be able to provide stable read-
ings. A short warm up of a few minutes before you start the recording helps.
• Skin pigmentation and tattoos block light and prevent reliable readings from the
optical sensor.
• The optical sensor may not provide accurate heart rate readings for swimming
activities.
• For highest accuracy and quickest responses to changes in your heart rate, we
recommend using a compatible chest heart rate sensor such as Suunto Smart
Sensor.
WARNING: Optical heart rate sensor technology is currently not as accurate or
reliable as measuring heart rate from the chest. Your actual heart rate may be higher
or lower than the optical sensor reading.
WARNING: Only for recreational use.
WARNING: Always consult a doctor before beginning a training program.
Overexertion may cause serious injury.
WARNING: Allergic reaction or skin irritations may occur when products are in
contact with skin, even though our products comply with industry standards. In such
event, stop use immediately and consult a doctor.
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