User's Manual

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Wear FB417

Place FB417 around your wrist. If you need to attach a different size wristband, or if you

purchased an accessory wristband, see the instructions in "Change the wristband" on page 9.

Placement for all-day wear vs exercise

When you're not exercising, wear FB417 a finger's width above your wrist bone.

For optimized heart-rate tracking while exercising:

• We recommend wearing FB417 higher on your wrist during exercise for an improved fit

and more accurate heart-rate reading. Many exercises, such as bike riding or weight

lifting, cause you to bend your wrist frequently, which can interfere with the heart-rate

signal if the tracker is lower on your wrist.

• Make sure the tracker is in contact with your skin.

• Don't wear your tracker too tight; a tight wristband restricts blood flow, potentially

affecting the heart-rate signal. The tracker should be slightly tighter (snug but not

constricting) during exercise.

• With high-intensity interval training or other activities where your wrist is moving

vigorously and non-rhythmically, the movement may limit the sensor's ability to provide

a heart-rate reading. If your tracker doesn't show a heart-rate reading, try relaxing your

wrist and staying still briefly.

Handedness

For greater accuracy, you must specify whether you wear FB417 on your dominant or non-

dominant hand. Your dominant hand is the one you use for writing and eating. To start, the

Wrist setting is set to non-dominant. If you wear FB417 on your dominant hand, change the

Wrist setting in the Fitbit app.