Aukey Wearbuds AI-W20 Guide De Démarrage Rapide page 13

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6. Wearing the band
Adjust the band until it is comfortably fits on your wrist. Wearing the
wristband too loosely may affect the accuracy of the heat rate sensor.
1 2 3
Adjust and secure by pressing Thread the strap
the metal fastener through the loop.
into one of theadjustment holes.
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