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Suunto 7 uses wrist heart rate (WHR) technology, also known as optical heart rate, which measures heart rate via LEDs to track blood flow in your wrist. This means that you can see your heart rate data during your exercise or in daily use without a chest heart rate strap.
Suunto Wear app does not support using an external heart rate belt.
The accuracy of optical HR measurement is influenced by a number of factors and it can differ depending on the person. One of the factors that makes the biggest difference is how you wear your watch. The right fit can help improve the accuracy of your heart rate readings. Start with the following tips, then test and improve the fit of your watch until you find your personal optimal spot.
During daily use
Wear your Suunto watch at least 1 finger above your wrist bone and make sure the watch is snug on your wrist. Your watch should always maintain contact with your skin so that you can't see the light shining from the sensor.
Test the fit – the key is to wear the watch as high up on your wrist as possible, and to prevent it from sliding down during exercise. A good indicator is to wear it about 2 fingers above your wrist bone. Again, make sure you wear the watch tight and close against the skin, however not tight enough to cut off blood circulation.
The optical heart rate feature may not be accurate for every user during every activity. Optical heart rate may also be affected by an individual’s unique anatomy and skin pigmentation. Your actual heart rate may be higher or lower than the optical sensor reading.
Only for recreational use; the optical heart rate feature is not for medical use.
Always consult a doctor before beginning a training program. Overexertion may cause serious injury.
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.